US20170255005A1 - Illumination apparatus, illumination method, exposure apparatus, and device manufacturing method - Google Patents
Illumination apparatus, illumination method, exposure apparatus, and device manufacturing method Download PDFInfo
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- US20170255005A1 US20170255005A1 US15/599,017 US201715599017A US2017255005A1 US 20170255005 A1 US20170255005 A1 US 20170255005A1 US 201715599017 A US201715599017 A US 201715599017A US 2017255005 A1 US2017255005 A1 US 2017255005A1
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- illumination
- light
- plane
- spatial light
- reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0031—Reflecting element, sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/02—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
- G02B26/0833—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0905—Dividing and/or superposing multiple light beams
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/18—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical projection, e.g. combination of mirror and condenser and objective
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70058—Mask illumination systems
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70058—Mask illumination systems
- G03F7/70075—Homogenization of illumination intensity in the mask plane by using an integrator, e.g. fly's eye lens, facet mirror or glass rod, by using a diffusing optical element or by beam deflection
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70058—Mask illumination systems
- G03F7/70091—Illumination settings, i.e. intensity distribution in the pupil plane or angular distribution in the field plane; On-axis or off-axis settings, e.g. annular, dipole or quadrupole settings; Partial coherence control, i.e. sigma or numerical aperture [NA]
- G03F7/70108—Off-axis setting using a light-guiding element, e.g. diffractive optical elements [DOEs] or light guides
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70058—Mask illumination systems
- G03F7/70091—Illumination settings, i.e. intensity distribution in the pupil plane or angular distribution in the field plane; On-axis or off-axis settings, e.g. annular, dipole or quadrupole settings; Partial coherence control, i.e. sigma or numerical aperture [NA]
- G03F7/70116—Off-axis setting using a programmable means, e.g. liquid crystal display [LCD], digital micromirror device [DMD] or pupil facets
Definitions
- An embodiment of the present invention relates to an illumination apparatus incorporating a spatial modulation unit for generating a predetermined light intensity distribution (pupil luminance distribution) on an illumination pupil plane on the basis of light from a light source, an illumination method using the spatial modulation unit, an exposure apparatus incorporating the illumination apparatus, and a device manufacturing method using the exposure apparatus.
- a reflection-type spatial light modulator is hitherto known as a spatial modulator to form a pupil luminance distribution for modified illumination (e.g., a dipolar, quadrupolar, or other distribution) in exposure apparatus.
- modified illumination e.g., a dipolar, quadrupolar, or other distribution
- Such a reflection-type spatial light modulator is described, for example, in Japanese Patent Application Laid-open No. 2002-353105 (Document 1).
- Patent Document 2 U.S. Pat. No. 6,466,304.
- a multilevel pupil luminance distribution is obtained by placing a spatial filter with a number of transparent regions composed of a semitransparent substrate and a masking film, in the illumination pupil plane.
- the above-cited Document 1 discloses nothing about formation of the multilevel pupil luminance distribution. Since the technology in the above-cited Document 2 uses the spatial filter to obtain the multilevel pupil luminance distribution, it fails to obtain a multilevel pupil luminance distribution in which luminances (light intensities) in respective zones on the illumination pupil plane are optionally controlled.
- An embodiment of the present invention has been accomplished in order to solve the problem as described above, and provides an illumination apparatus and illumination method with a structure capable of forming a multilevel pupil luminance distribution in which luminances in respective zones on the illumination pupil plane are optionally controlled, and to provide an exposure apparatus incorporating the illumination apparatus and a device manufacturing method using the exposure apparatus.
- An embodiment of the present invention provides an illumination apparatus and illumination method which are configured to form a predetermined light intensity distribution on an illumination pupil plane on the basis of light from a light source, and to implement Köhler illumination on an illumination target surface using the predetermined light intensity distribution as a light source.
- an embodiment of the present invention provides an illumination apparatus which comprises a spatial light modulator, a condensing optical system, and a control unit.
- the spatial light modulator has a plurality of reflecting surfaces whose postures are controlled independently of each other. These reflecting surfaces are two-dimensionally arranged on an optical path of light traveling from a light source to an illumination pupil plane.
- the condensing optical system are arranged in a light path of light from the reflecting surfaces of the spatial light modulator to form a predetermined light intensity distribution on the illumination pupil plane.
- the condensing optical system condenses light from the reflecting surfaces of the spatial light modulator to form a predetermined light intensity distribution on the illumination pupil plane.
- the control unit feeds a control signal to the spatial light modulator in accordance with a light intensity distribution to be formed on the illumination pupil plane.
- the condensing optical system converts light provided with a predetermined angle distribution by the reflecting surfaces of the spatial light modulator, into a position distribution on the illumination pupil plane.
- the control unit controls a number of the reflecting surfaces contributing to arriving light, for each of points on the illumination pupil plane constituting the light intensity distribution.
- An embodiment of the present invention provides an illumination method which comprises arrangement of a plurality of reflecting surfaces, arrangement of a condensing optical system, and posture control of the reflecting surfaces.
- the postures of the respective reflecting surfaces are controlled independently of each other and the reflecting surfaces are two-dimensionally arranged on an optical path of light traveling from a light source to an illumination pupil plane.
- the condensing optical system is arranged on an optical path of light traveling from the reflecting surfaces to the illumination pupil plane and functions to convert light provided with a predetermined angle distribution by the reflecting surfaces, into a position distribution on the illumination pupil plane.
- the posture control of the reflecting surfaces comprises first controlling a number of the reflecting surfaces contributing to arriving light, for each of points on the illumination pupil plane constituting the light intensity distribution, when the predetermined light intensity distribution is formed on the illumination pupil plane by condensing the light from the reflecting surfaces by the condensing optical system.
- the posture control is carried out for each group of reflecting surfaces controlled in this manner.
- An embodiment of the present invention provides an exposure apparatus which comprises the illumination apparatus with the structure as described above (an embodiment of the illumination apparatus according to the present invention) for illuminating a predetermined pattern, and performs exposure of the predetermined pattern on a photosensitive substrate.
- An embodiment of the present invention provides a device manufacturing method which is to manufacture a desired device, using the exposure apparatus with the structure as described above (an embodiment of the exposure apparatus according to the present invention).
- the device manufacturing method comprises an exposure block, a development block, and a processing block.
- the exposure block is to effect the exposure of the predetermined pattern on the photosensitive substrate, using the exposure apparatus with the structure as described above.
- the development block is to develop the photosensitive substrate onto which the predetermined pattern has been transferred, and thereafter to form a mask layer in a shape corresponding to the predetermined pattern on a surface of the photosensitive substrate.
- the processing block is to process the surface of the photosensitive substrate through the mask layer.
- FIG. 1 is a drawing schematically showing a configuration of the exposure apparatus according to an embodiment of the present invention
- FIG. 2 is an optical path diagram showing arrangement of a spatial light modulator and a condensing optical system, as a major part of the illumination apparatus and illumination method according to an embodiment of the present invention
- FIGS. 3A to 3D are drawings schematically showing a configuration of the spatial light modulator shown in FIG. 2 ;
- FIG. 4 is a drawing for explaining an example of grouping of a plurality of mirror elements in the spatial light modulator shown in FIG. 2 ;
- FIGS. 5A and 5B are drawings for schematically explaining another example of a technique to control a pupil intensity distribution on a multilevel basis
- FIG. 6 is a flowchart for explaining manufacturing blocks of semiconductor devices, as the device manufacturing method according to an embodiment of the present invention.
- FIG. 7 is a flowchart for explaining manufacturing blocks of a liquid crystal device such as a liquid crystal display device, as the device manufacturing method according to another embodiment of the present invention.
- FIGS. 1 to 3, 3A to 3D, 4, 5A, 5B and 6 to 7 the same portions and the same elements will be denoted by the same reference symbols, without redundant description.
- FIG. 1 is a drawing schematically showing a configuration of the exposure apparatus according to an embodiment of the present invention.
- the Z-axis is set along a direction of a normal to a wafer W being a photosensitive substrate, the Y-axis along a direction parallel to the plane of FIG. 1 in a plane of the wafer W, and the X-axis along a direction normal to the plane of FIG. 1 in the plane of the wafer W.
- the exposure apparatus EA has an illumination apparatus IL, a mask stage MS supporting a mask M, a projection optical system PL, and a wafer stage WS supporting the wafer W.
- the illumination apparatus IL has a light source 1 and a spatial light modulation unit 3 arranged in the order named along the optical axis AX of the exposure apparatus EA.
- the exposure apparatus EA is configured to illuminate the mask M by means of the illumination apparatus IL on the basis of light from the light source 1 and to project an image of a surface with a pattern thereon (first surface) of the mask M, onto a surface on the wafer W (second surface) by means of the projection optical system PL.
- the illumination apparatus IL which illuminates the surface with the pattern thereon (first surface) of the mask M with the light supplied from the light source 1 , implements modified illumination (off-axis illumination), e.g., dipole, quadrupole, or other illumination by means of the spatial light modulation unit 3 .
- modified illumination off-axis illumination
- the illumination apparatus IL has a polarization control unit 2 , a spatial light modulation unit 3 , a zoom optical system 4 , a fly's eye lens 5 , a condenser optical system 6 , an illumination field stop (mask blind) 7 , and a field stop imaging optical system 8 along the optical axis AX.
- the spatial light modulation unit 3 forms a desired pupil luminance distribution (pupil intensity distribution) in its far field (Fraunhofer diffraction region), based on the light from the light source 1 having traveled through the polarization control unit 2 .
- a spatial light modulator 3 a of the spatial light modulation unit 3 is composed of a large number of mirror elements as described below, and the illumination apparatus IL also has a control unit 10 which outputs a control signal for controlling inclinations of these mirror elements, to the spatial light modulator 3 a.
- the polarization control unit 2 is disclosed, for example, in U.S. Patent Published Application No. 2006/0055834A1.
- the teachings of the U.S. Patent Published Application No. 2006/0055834A1 are incorporated by reference.
- the fly's eye lens 5 divides the wavefront of incident light and forms a secondary light source consisting of light source images as many as lens elements thereof on the rear focal plane of the fly's eye lens 5 .
- the fly's eye lens 5 applicable herein is, for example, a cylindrical micro fly's eye lens. Such a cylindrical micro fly's eye lens is disclosed, for example, in U.S. Pat. No. 6,913,373. The teachings of the U.S. Pat. No. 6,913,373 are incorporated by reference.
- the mask M disposed on an illumination target surface is subjected to Köhler illumination, using the secondary light source formed by the fly's eye lens 5 , as a light source. Therefore, the plane where this secondary light source is formed becomes a plane conjugate with an aperture stop of the projection optical system PL and thus can be called an illumination pupil plane of the illumination apparatus IL.
- the illumination target surface (the surface where the mask M is arranged or the surface where the wafer W is arranged) becomes an optical Fourier transform surface with respect to the illumination pupil plane.
- the pupil luminance distribution (which is also referred to as a pupil intensity distribution) is a light intensity distribution on the illumination pupil plane of the illumination apparatus IL or on a plane conjugate with the illumination pupil plane.
- a pupil intensity distribution is a light intensity distribution on the illumination pupil plane of the illumination apparatus IL or on a plane conjugate with the illumination pupil plane.
- the number of wavefront divisions by the fly's eye lens 5 is large, there is a high correlation between the global light intensity distribution formed on the entrance plane of the fly's eye lens 5 and the global light intensity distribution of the entire secondary light source, and, therefore, the light intensity distributions on the entrance plane of the fly's eye lens 5 and on the plane conjugate with the entrance plane can also be called pupil luminance distributions.
- the condenser optical system 6 condenses beams of light emitted from the fly's eye lens 5 and thereafter the condensed beams illuminate the illumination field stop 7 in a superimposed manner.
- the light from the illumination field stop 7 travels through the field stop imaging optical system 8 to reach the mask M with the predetermined pattern thereon and to form an illumination region as an image of an aperture of the illumination field stop 7 in at least a part of the pattern-formed region of the mask M.
- FIG. 1 is depicted without any path bending mirror for bending the optical axis AX, but it is possible to arrange a path bending mirror or path bending mirrors as occasion may demand.
- the mask M is mounted on the mask stage MS.
- the projection optical system PL forms an image of the first surface on a projection surface (second surface) Wa of the wafer W mounted on the wafer stage WS, based on light from the illumination region formed on the pattern surface (first surface) of the mask M by the illumination apparatus IL.
- one-shot exposure or scan exposure is carried out while two-dimensionally driving and controlling the wafer stage WS and, therefore, two-dimensionally driving and controlling the wafer W, in the plane (X-Y plane) perpendicular to the optical axis AX of the projection optical system PL.
- This causes the pattern of the mask M to be sequentially transferred into each of exposure areas on the wafer W.
- FIG. 2 is an optical path diagram showing the spatial light modulation unit 3 and zoom optical system 4 shown in FIG. 1 .
- FIG. 3A is a partial perspective view of the spatial light modulator 3 a in the spatial light modulation unit 3
- FIG. 3B is a drawing for explaining parameters for control on the postures of the mirror elements
- FIG. 3C is a partial perspective view showing one of the mirror elements in the spatial light modulator 3 a
- FIG. 3D is a drawing showing a cross section along line I-I of the mirror element shown in FIG. 3C . It is noted that FIGS. 2 and 3 are depicted without hatching for sections, for easier viewing.
- the spatial light modulation unit 3 has a prism 3 b , and the reflective spatial light modulator 3 a attached integrally to the prism 3 b .
- the prism 3 b is made of a glass material, e.g., fluorite.
- the prism 3 b is of a shape in which one side face of a rectangular parallelepiped is depressed in a V-shaped wedge form, and is also called a K prism.
- one side face of the rectangular parallelepiped part is composed of two planes PS 1 , PS 2 (first and second planes PS 1 , PS 2 ) intersecting at an obtuse angle as an intersecting line (straight line) P 1 a between them subsides inside.
- the spatial light modulator 3 a is attached onto a side face of the prism 3 b facing both of these two side faces in contact at the intersecting line P 1 a .
- the optical material forming the base of the spatial light modulator 3 a is not limited to fluorite, but it may be silica glass or other optical glass.
- the two side faces (the sides facing each other) in contact at the intersecting line P 1 a function as first and second reflecting surfaces R 11 , R 12 . Therefore, the first reflecting surface R 11 is located on the first plane PS 1 .
- the second reflecting surface R 12 is located on the second plane PS 2 intersecting with the first plane PS 1 .
- the angle between the first and second reflecting surfaces R 11 , R 12 is an obtuse angle.
- angles herein may be determined, for example, as follows: the angle between the first and second reflecting surfaces R 11 , R 12 is 120°; the angle between the side face (entrance plane IP) of the prism P 1 perpendicular to the optical axis AX, and the first reflecting surface R 11 is 60°; the angle between the side face (exit plane OP) of the prism P 1 perpendicular to the optical axis AX, and the second reflecting surface R 12 is 60°.
- the prism 3 b is so arranged that the side face to which the spatial light modulator 3 a is attached is parallel to the optical axis AX, that the first reflecting surface R 11 is located on the light source 1 side (upstream in the exposure apparatus EA), and that the second reflecting surface R 12 is located on the fly's eye lens 5 side (downstream in the exposure apparatus EA). Therefore, the first reflecting surface R 11 of the prism 3 b is obliquely arranged with respect to the optical axis AX of the exposure apparatus EA, as shown in FIG. 2 .
- the second reflecting surface R 12 of the prism 3 b is also obliquely arranged with an opposite inclination to the first reflecting surface R 11 with respect to the optical axis AX of the exposure apparatus EA, as shown in FIG. 2 .
- the first reflecting surface R 11 of the prism 3 b reflects light incident in parallel with the optical axis AX of the exposure apparatus EA.
- the spatial light modulator 3 a is arranged in the optical path between the first reflecting surface R 11 and the second reflecting surface R 12 and reflects the light reflected on the first reflecting surface R 11 .
- the second reflecting surface R 12 of the prism 3 b reflects the light reflected on the spatial light modulator 3 a . This light from the reflecting surface R 12 is emitted, specifically, into the zoom optical system 4 in the illumination apparatus IL of the exposure apparatus EA.
- the intersecting line P 1 a being a ridge line formed by the first and second planes PS 1 , PS 2 is located on the spatial light modulator 3 a side with respect to the first and second reflecting surfaces R 11 , R 12 .
- the prism 3 b in this embodiment is integrally formed of one optical block, but the prism 3 b may be constructed using a plurality of optical blocks.
- the spatial light modulator 3 a applies spatial modulation to the incident light, according to a position where the light reflected on the first reflecting surface R 11 is incident.
- This spatial light modulator 3 a includes a large number of microscopic mirror elements SE 1 arranged two-dimensionally on a predetermined plane.
- the light beam incident to the spatial light modulator 3 a travels, for example, as follows: a ray L 1 impinges upon a mirror element SE 1 a out of the plurality of mirror elements SE 1 of the spatial light modulator 3 a ; a ray L 2 impinges upon a mirror element SE 1 b different from the mirror element SE 1 a out of the plurality of mirror elements SE 1 of the spatial light modulator 3 a ; a ray L 3 impinges upon a mirror element SE 1 c different from the mirror elements SE 1 a , SE 1 b out of the plurality of mirror elements SE 1 of the spatial light modulator 3 a ; a ray L 4 impinges upon a mirror element SE 1 d different from the mirror elements SE 1 a -SE 1 c out of the plurality of mirror elements SE 1 of the spatial light modulator 3 a ; a ray L 5 impinges upon a mirror element SE 1 e different from the mirror elements SE 1 a -
- the mirror elements SE 1 a -SE 1 e apply the spatial modulation according to the installation position of their own to the arriving rays L 1 -L 5 , respectively.
- FIG. 2 is depicted with illustration of only the five mirror elements SE 1 a -SE 1 e , for easier explanation, but the number of mirror elements does not have to be limited to five.
- the prism 3 b is so arranged that an air-equivalent length from the entrance plane IP of the prism 3 b (where the rays L 1 -L 5 are incident) via the mirror elements SE 1 a - SE 1 e to the exit plane OP of the prism 3 b where the rays are outgoing, is equal to an air-equivalent length from a position corresponding to the entrance plane IP to a position corresponding to the exit plane OP without the prism 3 b in the exposure apparatus EA.
- An air-equivalent length is an optical path length obtained by reducing an optical path length in an optical system to one in air having the refractive index of 1, and an air-equivalent length in a medium having the refractive index n is obtained by multiplying an optical path length therein by 1/n.
- the spatial light modulator 3 a is arranged near the front focal point of the zoom optical system 4 which can be regarded as a condensing optical system.
- the light reflected by the mirror elements SE 1 a -SE 1 e of the spatial light modulator 3 a and provided with a predetermined angle distribution forms a light intensity distribution at a predetermined position on the rear focal plane 5 a of the zoom optical system 4 .
- the zoom optical system 4 is a Fourier transform optical system which converts angles given to the emerging rays by the mirror elements SE 1 a -SE 1 e of the spatial light modulator 3 a , into positions on the plane 5 a being the far field (Fraunhofer diffraction region) of the spatial light modulator 3 a .
- the zoom optical system 4 applicable herein is, for example, a zoom optical system whose projection is an orthogonal projection.
- the entrance plane of the fly's eye lens 5 is located near this plane Sa and the light intensity distribution (luminance distribution) of the secondary light source formed by the fly's eye lens 5 is a distribution according to the light intensity distribution formed by the spatial light modulator 3 a and zoom optical system 4 .
- the spatial light modulator 3 a is a movable multi- mirror including the mirror elements SE 1 being a large number of microscopic reflecting elements laid with their reflecting surface of a planar shape up.
- Each mirror element SE 1 is movable and inclination of the reflecting surface thereof, i.e., an angle and direction of inclination of the reflecting surface, is independently controlled by the control unit 10 (posture control of the reflecting surfaces).
- Each mirror element SE 1 can be continuously or discretely rotated by a desired angle of rotation around each of axes along two directions parallel to the reflecting surface thereof and orthogonal to each other. Namely, each mirror element SE 1 is so configured that the inclination thereof can be controlled in two dimensions along the reflecting surface thereof.
- a preferred control method is to control the angle of rotation in multiple stages (e.g., . . . , ⁇ 2.5°, ⁇ 2.0°, . . . , 0°, +0.5°, . . . , +2.5°, . . .).
- the above-described posture control of the reflecting surface for each mirror element SE 1 is implemented by adjusting an angle 0 between a normal to a reference plane of the spatial light modulator 3 a (z-axis) and a normal to the reflecting surface (z′ axis), as shown in FIG. 3B .
- the reference plane herein is a plane coincident with the reflecting surface before the posture control, which is an x-y plane defined by an x-axis and a y-axis orthogonal to the normal z′ to the reflecting surface before the posture control.
- the angle ⁇ between the normal z (z-axis) to the reference plane and the normal z′ to the reflecting surface is given by a rotation angle component ⁇ x around the x-axis and a rotation angle component ⁇ y around the y-axis, as specific posture control information.
- the rotation angle component ⁇ x is an angle between the normal z to the reference plane and the normal z′ to the reflecting surface when the normal z′ is projected onto the y-z plane
- the rotation angle component ⁇ y is an angle between the normal z to the reference plane and the normal z′ to the reflecting surface when the normal z′ is projected onto the x-z plane.
- the contour of the mirror elements SE 1 is square in this embodiment, but the contour is not limited to it. However, the contour is preferably a shape permitting arrangement without a gap (the closest packing) in terms of light utilization efficiency.
- the gap between adjacent mirror elements SE 1 is preferably set to a necessary minimum level.
- FIG. 3C is a drawing schematically showing a configuration of one mirror element out of the plurality of mirror elements SE 1 of the spatial light modulator 3 a and, more specifically, a drawing schematically showing a drive unit for controlling the posture of the reflecting surface in the mirror element SE 1 .
- FIG. 3D is a drawing showing a cross section of the mirror element SE 1 along line I-I shown in FIG. 3C .
- the mirror element SE 1 has a base 30 , a support 31 disposed on this base 30 , a plate member 32 connected to the support 31 on the opposite side to the base 30 , a reflecting surface 33 consisting of a reflecting film formed on this plate member 32 , and four electrodes 34 a - 34 d arranged so as to surround the support 31 on the base 30 .
- the plate member 32 is inclinable around two axes (x-axis and y-axis) orthogonal to each other on a plane parallel to the base 30 with a fulcrum at a joint to the support 31 . Then potentials are given to the electrodes 34 a - 34 d arranged at respective positions on the base side corresponding to the four corners of the plate member 32 , to generate an electrostatic force between each electrode 34 a - 34 d and the plate member 32 , thereby varying the gap between each electrode 34 a - 34 d and the plate member 32 (drive unit). This causes the plate member 32 to be inclined on the fulcrum of the support 31 and, therefore, the reflecting surface 33 formed on the plate member 32 is inclined.
- each of the three mirror elements SE 1 a , SE 1 c , SE 1 e is inclined by a first angle ( ⁇ x1 , ⁇ y1 ) with respect to the reference plane of the spatial light modulator 3 a ; each of the two mirror elements SE 1 b , SE 1 d is inclined by a second angle ( ⁇ x2 , ⁇ y2 ) different from the first angle with respect to the reference plane of the spatial light modulator 3 a.
- the reference plane of the spatial light modulator 3 a (cf. FIG. 3B ) means a plane in which the large number of mirror elements SE 1 of the spatial light modulator 3 a are two-dimensionally arranged.
- the first angle and second angle are defined using rotation directions ⁇ x , ⁇ y around the rotation axes of two axes (x-axis and y-axis) orthogonal in the foregoing plane, as shown in FIG. 3B .
- the rays L 1 , L 3 , L 5 reflected on the three mirror elements SE 1 a , SE 1 c , SE 1 e of the spatial light modulator 3 a are reflected on the second reflecting surface R 12 of the prism 3 b and thereafter are condensed by the zoom optical system 4 .
- the rays L 1 , L 3 , L 5 arrive at a point P 1 on the rear focal plane Sa of the zoom optical system 4 .
- the rays L 2 , L 4 reflected on the two mirror elements SE 1 b , SE 1 d of the spatial light modulator 3 a are reflected on the second reflecting surface R 12 of the prism 3 b and thereafter are condensed by the zoom optical system 4 .
- the rays L 2 , L 4 arrive at a point P 2 on the rear focal plane 5 a of the zoom optical system 4 .
- the light intensity at a predetermined point is determined according to the number of reflecting surfaces (SE 1 a , SE 1 c , SE 1 e or SE 1 b , SE 1 d ) contributing to rays (L 1 , L 3 , L 5 or L 2 , L 4 ) arriving at the predetermined point (P 1 or P 2 ) on the rear focal plane 5 a of the zoom optical system 4 which can be regarded as the illumination pupil plane.
- the light intensity distribution on the plane 5 a can be controlled to a desired distribution.
- the light intensity distribution (pupil luminance distribution) formed on the plane 5 a is one in which the light intensity at the point P 1 is 3, the light intensity at the point P 2 is 2, and the light intensity in the other region is 0.
- the control unit 10 to perform the posture control in the spatial light modulator 3 a is configured to control the number of reflecting surfaces contributing to arriving light, for each point (e.g., P 1 or P 2 ) forming the light intensity distribution formed on the plane 5 a , the light intensity at the predetermined point (P 1 or P 2 ) on the plane 5 a can be set at a desired value and, in turn, the light intensity distribution on the plane 5 a can be optionally controlled on a multilevel basis.
- the zoom optical system 4 Since in this embodiment the zoom optical system 4 has the optical Fourier transform action, the rays are superimposed at one point P 1 on the rear focal plane 5 a of the zoom optical system 4 even though the inclinations of the three mirror elements SE 1 a , SE 1 c , SE 1 e are the same first angle ( ⁇ x1 , ⁇ y1 ); and the rays are also superimposed at one point P 2 on the rear focal plane 5 a of the zoom optical system 4 even though the inclinations of the two mirror elements SE 1 b , SE 1 d are the same second angle ( ⁇ x2 , ⁇ y2 ).
- the inclinations of the reflecting surfaces contributing to light arriving at a certain point on the plane 5 a are controlled not to different inclinations, but to the same inclination (the same posture).
- the angle information of light caused by inclinations of the mirror elements SE 1 of the spatial light modulator 3 a is converted into position information on the plane 5 a being a Fourier transform plane, by the optical Fourier transform action of the zoom optical system 4 .
- angle information of light on the Fourier transform plane 5 a is converted into position information on the arrangement plane of the mirror elements SE 1 of the spatial light modulator 3 a .
- NA divergence angle
- selection of settings of mirror elements and inclinations thereof can be done without any restrictions on which mirror element SE 1 should be set at which inclination out of the plurality of mirror elements SE 1 , for setting the light intensity distribution (pupil luminance distribution) formed on the plane 5 a , to a desired distribution.
- FIGS. 5A and 5B are drawings for schematically explaining another example of the method for multilevel control of the pupil intensity distribution.
- FIG. 5A is a matrix showing an example of the light intensity distribution (pupil intensity distribution) of 4-valued expression where the illumination pupil plane is composed of 15 pixels in 3 rows ⁇ 5 columns
- FIG. 5B is a drawing for schematically explaining assignment of light necessary for obtaining the multilevel light intensity distribution shown in FIG. 5A .
- the example shown in FIGS. 5A and 5B showed the division of 15 pixels of 3 ⁇ 5 pixels for the illumination pupil plane in order to simplify the description, but the number of divisions of the illumination pupil plane does not have to be limited to 15, and may be a larger number of divisions, e.g., 40 ⁇ 40 pixels, 128 ⁇ 128 pixels, and so on. Furthermore, the example shown in FIGS. 5A and 5B showed the multilevel expression of the light intensity distribution formed on the illumination pupil plane, based on the multiple values of four levels, but the multilevels do not have to be limited to the four levels, and can be any of various numbers of levels according to need, e.g., three levels, eight levels, and so on.
- the total number of reflecting surfaces necessary for formation of the desired light intensity distribution on the illumination pupil plane is not equal to the total number of mirror elements SE 1 of the spatial light modulator 3 a illuminated with the light from the light source 1 (which will be referred to hereinafter as an effective number of mirror elements), specifically, when there is a remainder when the effective number of mirror elements is divided by the total number of reflecting surfaces necessary for formation of the pupil intensity distribution on the illumination pupil plane, it is preferable that the light reflected on the remaining reflecting surfaces be directed to the region other than the illumination pupil plane.
- the illumination pupil plane is divided in 128 ⁇ 128 pixels and that reflected light from the remaining mirror elements is also guided to any of pixels forming the effective pupil constituting the light intensity distribution.
- the intensity unevenness of the light intensity distribution formed on the illumination pupil plane is given by
- , or ⁇ 3.7% ( ⁇ (1/27) ⁇ 100).
- the spatial light modulator with the plurality of optical elements arranged two-dimensionally and controlled individually had the structure in which each optical element was supported so as to be inclinable on a fulcrum at one support in the center thereof.
- the spatial light modulator in which the orientations (inclinations) of the reflecting surfaces arranged two-dimensionally can be individually controlled is used as the spatial light modulator with the plurality of optical elements arranged two-dimensionally and controlled individually.
- a spatial light modulator in which heights (positions) of the reflecting surfaces arranged two-dimensionally can be individually controlled is, for example, one selected from those disclosed in Japanese Patent Application Laid-open No. 6-281869 and U.S. Pat. No. 5,312,513 corresponding thereto, and in FIG. 1 d of Japanese Patent Application Laid-open (Translation of PCT Application) No.
- control unit may be configured to control the number of depressions and projections of the reflecting surfaces in the spatial light modulator (the posture control of the reflecting surfaces in the spatial light modulator by the control unit).
- the aforementioned spatial light modulator with the plurality of reflecting surfaces arranged two-dimensionally may be modified, for example, according to the disclosure in Japanese Patent Application Laid-open (Translation of PCT Application) No. 2006-513442 and U.S. Pat. No. 6,891,655 corresponding thereto, or according to the disclosure in Japanese Patent Application Laid-open (Translation of PCT Application) No. 2005-524112 and U.S. Patent Published Application No. 2005/0095749 corresponding thereto.
- the teachings of the U.S. Pat. No. 6,891,655 and the U.S. Patent Published Application No. 2005/0095749 are incorporated by reference.
- the apparatus may be modified so that in the formation of the light intensity distribution (pupil luminance distribution) on the illumination pupil plane using the spatial light modulator 3 , the light intensity distribution formed is measured with a light intensity distribution measuring device (pupil luminance distribution measuring device) and the spatial light modulator 3 is controlled according to the result of the measurement.
- a light intensity distribution measuring device piupil luminance distribution measuring device
- Such technology is disclosed, for example, in Japanese Patent Application Laid-open No. 2006-54328 and in Japanese Patent Application Laid-open No. 2003-22967 and U.S. Patent Published Application No. 2003/0038225 corresponding thereto.
- the teachings of the U.S. Patent Published Application No. 2003/0038225 are incorporated by reference.
- the mask can be replaced with a variable pattern forming device which forms a predetermined pattern on the basis of predetermined electronic data.
- the variable pattern forming device applicable herein is, for example, a spatial light modulator including a plurality of reflecting elements driven based on predetermined electronic data.
- the exposure apparatus with such a spatial light modulator is disclosed, for example, in Japanese Patent Application Laid-open No. 2004-304135 and International Publication WO 2006/080285 and U.S. Pat. Published Application No. 2007/0296936 corresponding thereto.
- the teachings of the U.S. Pat. Published Application No. 2007/0296936 are incorporated by reference.
- Besides the reflective spatial light modulators of the non-emission type it is also possible to use a transmissive spatial light modulator or a self-emission type image display device.
- a technique of filling the interior of the optical path between the projection optical system and the photosensitive substrate with a medium having the refractive index larger than 1.1 typically, a liquid
- a liquid immersion method it is possible to adopt one of the following techniques as a technique of filling the interior of the optical path between the projection optical system and the photosensitive substrate with the liquid: the technique of locally filling the optical path with the liquid as disclosed in International Publication WO99/49504; the technique of moving a stage holding the substrate to be exposed, in a liquid bath as disclosed in Japanese Patent Application Laid-open No.
- the exposure apparatus of the foregoing embodiment is manufactured by assembling various sub-systems containing their respective components as set forth in the scope of claims in the present application, so as to maintain predetermined mechanical accuracy, electrical accuracy, and optical accuracy.
- the following adjustments are carried out before and after the assembling: adjustment for achieving the optical accuracy for various optical systems; adjustment for achieving the mechanical accuracy for various mechanical systems; adjustment for achieving the electrical accuracy for various electrical systems.
- the assembling blocks from the various sub-systems into the exposure apparatus include mechanical connections, wire connections of electric circuits, pipe connections of pneumatic circuits, etc. between the various sub-systems.
- FIG. 6 is a flowchart for explaining manufacturing blocks of semiconductor devices, as the device manufacturing method according to an embodiment of the present invention.
- the manufacturing blocks of semiconductor devices include depositing a metal film on a wafer W to become a substrate of semiconductor devices (block S 40 ) and applying a photoresist as a photosensitive material onto the deposited metal film (block S 42 ).
- the subsequent blocks include transferring a pattern formed on a mask (reticle) M, into each shot area on the wafer W, using the exposure apparatus (projection exposure apparatus) of the foregoing embodiment (block S 44 : exposure block), and developing the wafer W after completion of the transfer, i.e., developing the photoresist to which the pattern has been transferred (block S 46 : development block). Thereafter, using the resist pattern made on the surface of the wafer W in block S 46 , as a mask, processing such as etching is carried out on the surface of the wafer W (block S 48 : processing block).
- the resist pattern herein is a photoresist layer in which depressions and projections are formed in a shape corresponding to the pattern transferred by the projection exposure apparatus of the foregoing embodiment and which the depressions penetrate throughout.
- Step S 48 is to process the surface of the wafer W through this resist pattern.
- the processing carried out in block S 48 includes, for example, at least either etching of the surface of the wafer W or deposition of a metal film or the like.
- the projection exposure apparatus of the foregoing embodiment performs the transfer of the pattern onto the wafer W coated with the photoresist, as a photosensitive substrate or plate P.
- FIG. 7 is a flowchart for explaining manufacturing blocks of a liquid crystal device such as a liquid-crystal display device, as the device manufacturing method according to another embodiment of the present invention.
- the manufacturing blocks of the liquid crystal device include sequentially performing a pattern forming block (block S 50 ), a color filter forming block (block S 52 ), a cell assembly block (block S 54 ), and a module assembly block (block S 56 ).
- the pattern forming block of block S 50 is to form predetermined patterns such as a circuit pattern and an electrode pattern on a glass substrate coated with a photoresist, as a plate P, using the projection exposure apparatus of the foregoing embodiment.
- This pattern forming block includes an exposure block of transferring a pattern to a photoresist layer, using the aforementioned projection exposure apparatus, a development block of performing development of the plate P onto which the pattern has been transferred, i.e., development of the photoresist layer on the glass substrate, and then making the photoresist layer in the shape corresponding to the pattern, and a processing block of processing the surface of the glass substrate through the developed photoresist layer.
- the color filter forming block of block S 52 is to form a color filter in which a large number of sets of three dots corresponding to R (Red), G (Green), and B (Blue) are arrayed in a matrix pattern, or in which a plurality of filter sets of three stripes of R, G, and B are arrayed in a horizontal scan direction.
- the cell assembly block of block S 54 is to assemble a liquid crystal panel (liquid crystal cell), using the glass substrate on which the predetermined pattern has been formed in block S 50 , and the color filter formed in block S 52 . Specifically, for example, a liquid crystal is poured into between the glass substrate and the color filter to form the liquid crystal panel.
- the module assembly block of block S 56 is to attach various components such as electric circuits and backlights for display operation of this liquid crystal panel, to the liquid crystal panel assembled in block S 54 .
- An embodiment of the present invention is not limited only to the application to the exposure apparatus for manufacture of semiconductor devices, but can also be widely applied, for example, to the exposure apparatus for the liquid-crystal display devices formed with rectangular glass plates, or for display devices such as plasma displays, and to the exposure apparatus for manufacture of various devices such as imaging devices (CCDs and others), micromachines, thin-film magnetic heads, and DNA chips. Furthermore, an embodiment of the present invention is also applicable to the exposure block (exposure apparatus) for manufacture of masks (photomasks, reticles, etc.) with mask patterns of various devices thereon, by the photolithography process.
- the light (exposure light) supplied by the light source 1 can be an ArF excimer laser light (wavelength: 193 nm) or a KrF excimer laser light (wavelength: 248 nm).
- ArF excimer laser light wavelength: 193 nm
- KrF excimer laser light wavelength: 248 nm
- an embodiment of the present invention can also be applied to a generally-used illumination optical system which illuminates an illumination target surface except for the mask.
- an embodiment of the present invention successfully provides the multilevel pupil luminance distribution (pupil intensity distribution) in which luminances in respective zones are optionally controlled.
Abstract
To optionally forming a multilevel light intensity distribution on an illumination pupil plane, the illumination apparatus implements Köller illumination on an illumination target surface, using as a light source the light intensity distribution formed on the illumination pupil plane on the basis of light from a light source. The illumination apparatus has a spatial light modulator, a condensing optical system, and a controller. The spatial light modulator has reflecting surfaces which are two-dimensionally arranged and postures of which can be controlled independently of each other. The condensing optical system condenses light from the reflecting surfaces to form a predetermined light intensity distribution on the illumination pupil plane. The controller controls the number of reflecting surfaces contributing to arriving light, for each of points on the illumination pupil plane forming the light intensity distribution, according to a light intensity distribution to be formed on the illumination pupil plane.
Description
- This application is a Continuation of U.S. application Ser. No. 14/664,576 filed Mar. 20, 2015, which is a Continuation of application Ser. No. 12/256,055 filed Oct. 22, 2008, which is based upon and claims the benefit of priority (priorities) from Provisional Application No. 60/996,295 filed Nov. 9, 2007 and Japanese Patent Application No. 2007-287987 filed Nov. 6, 2007, the entire contents of the prior applications being incorporated herein by reference.
- Field of the Invention
- An embodiment of the present invention relates to an illumination apparatus incorporating a spatial modulation unit for generating a predetermined light intensity distribution (pupil luminance distribution) on an illumination pupil plane on the basis of light from a light source, an illumination method using the spatial modulation unit, an exposure apparatus incorporating the illumination apparatus, and a device manufacturing method using the exposure apparatus.
- Related Background Art
- A reflection-type spatial light modulator is hitherto known as a spatial modulator to form a pupil luminance distribution for modified illumination (e.g., a dipolar, quadrupolar, or other distribution) in exposure apparatus. Such a reflection-type spatial light modulator is described, for example, in Japanese Patent Application Laid-open No. 2002-353105 (Document 1).
- There is also a recent trend to demand multilevel (3- or more-valued) distributions rather than a simple binary (presence/absence of light) distribution, as pupil luminance distributions for modified or off-axis illumination (e.g., cf. Patent Document 2: U.S. Pat. No. 6,466,304). In
Document 2, a multilevel pupil luminance distribution is obtained by placing a spatial filter with a number of transparent regions composed of a semitransparent substrate and a masking film, in the illumination pupil plane. - The inventor studied the foregoing conventional technology and found the following problem.
- Specifically, the above-cited
Document 1 discloses nothing about formation of the multilevel pupil luminance distribution. Since the technology in the above-citedDocument 2 uses the spatial filter to obtain the multilevel pupil luminance distribution, it fails to obtain a multilevel pupil luminance distribution in which luminances (light intensities) in respective zones on the illumination pupil plane are optionally controlled. - An embodiment of the present invention has been accomplished in order to solve the problem as described above, and provides an illumination apparatus and illumination method with a structure capable of forming a multilevel pupil luminance distribution in which luminances in respective zones on the illumination pupil plane are optionally controlled, and to provide an exposure apparatus incorporating the illumination apparatus and a device manufacturing method using the exposure apparatus.
- An embodiment of the present invention provides an illumination apparatus and illumination method which are configured to form a predetermined light intensity distribution on an illumination pupil plane on the basis of light from a light source, and to implement Köhler illumination on an illumination target surface using the predetermined light intensity distribution as a light source.
- In order to achieve the above object, an embodiment of the present invention provides an illumination apparatus which comprises a spatial light modulator, a condensing optical system, and a control unit. The spatial light modulator has a plurality of reflecting surfaces whose postures are controlled independently of each other. These reflecting surfaces are two-dimensionally arranged on an optical path of light traveling from a light source to an illumination pupil plane. The condensing optical system are arranged in a light path of light from the reflecting surfaces of the spatial light modulator to form a predetermined light intensity distribution on the illumination pupil plane. The condensing optical system condenses light from the reflecting surfaces of the spatial light modulator to form a predetermined light intensity distribution on the illumination pupil plane. The control unit feeds a control signal to the spatial light modulator in accordance with a light intensity distribution to be formed on the illumination pupil plane.
- Particularly, in an embodiment of the illumination apparatus, the condensing optical system converts light provided with a predetermined angle distribution by the reflecting surfaces of the spatial light modulator, into a position distribution on the illumination pupil plane. The control unit controls a number of the reflecting surfaces contributing to arriving light, for each of points on the illumination pupil plane constituting the light intensity distribution.
- An embodiment of the present invention provides an illumination method which comprises arrangement of a plurality of reflecting surfaces, arrangement of a condensing optical system, and posture control of the reflecting surfaces. The postures of the respective reflecting surfaces are controlled independently of each other and the reflecting surfaces are two-dimensionally arranged on an optical path of light traveling from a light source to an illumination pupil plane. The condensing optical system is arranged on an optical path of light traveling from the reflecting surfaces to the illumination pupil plane and functions to convert light provided with a predetermined angle distribution by the reflecting surfaces, into a position distribution on the illumination pupil plane. The posture control of the reflecting surfaces comprises first controlling a number of the reflecting surfaces contributing to arriving light, for each of points on the illumination pupil plane constituting the light intensity distribution, when the predetermined light intensity distribution is formed on the illumination pupil plane by condensing the light from the reflecting surfaces by the condensing optical system. The posture control is carried out for each group of reflecting surfaces controlled in this manner.
- An embodiment of the present invention provides an exposure apparatus which comprises the illumination apparatus with the structure as described above (an embodiment of the illumination apparatus according to the present invention) for illuminating a predetermined pattern, and performs exposure of the predetermined pattern on a photosensitive substrate.
- An embodiment of the present invention provides a device manufacturing method which is to manufacture a desired device, using the exposure apparatus with the structure as described above (an embodiment of the exposure apparatus according to the present invention). Specifically, the device manufacturing method comprises an exposure block, a development block, and a processing block. The exposure block is to effect the exposure of the predetermined pattern on the photosensitive substrate, using the exposure apparatus with the structure as described above. The development block is to develop the photosensitive substrate onto which the predetermined pattern has been transferred, and thereafter to form a mask layer in a shape corresponding to the predetermined pattern on a surface of the photosensitive substrate. The processing block is to process the surface of the photosensitive substrate through the mask layer.
- A general architecture that implements the various features of the invention will now be described with reference to the drawings. The drawings and the associated descriptions are provided to illustrate embodiments of the invention and not to limit the scope of the invention.
-
FIG. 1 is a drawing schematically showing a configuration of the exposure apparatus according to an embodiment of the present invention; -
FIG. 2 is an optical path diagram showing arrangement of a spatial light modulator and a condensing optical system, as a major part of the illumination apparatus and illumination method according to an embodiment of the present invention; -
FIGS. 3A to 3D are drawings schematically showing a configuration of the spatial light modulator shown inFIG. 2 ; -
FIG. 4 is a drawing for explaining an example of grouping of a plurality of mirror elements in the spatial light modulator shown inFIG. 2 ; -
FIGS. 5A and 5B are drawings for schematically explaining another example of a technique to control a pupil intensity distribution on a multilevel basis; -
FIG. 6 is a flowchart for explaining manufacturing blocks of semiconductor devices, as the device manufacturing method according to an embodiment of the present invention; and -
FIG. 7 is a flowchart for explaining manufacturing blocks of a liquid crystal device such as a liquid crystal display device, as the device manufacturing method according to another embodiment of the present invention. - In the following, embodiments of the illumination apparatus, illumination method, exposure apparatus, and device manufacturing method according to the present invention will be described below in detail with reference to
FIGS. 1 to 3, 3A to 3D, 4, 5A, 5B and 6 to 7 . In the description of the drawings, the same portions and the same elements will be denoted by the same reference symbols, without redundant description. -
FIG. 1 is a drawing schematically showing a configuration of the exposure apparatus according to an embodiment of the present invention. InFIG. 1 , the Z-axis is set along a direction of a normal to a wafer W being a photosensitive substrate, the Y-axis along a direction parallel to the plane ofFIG. 1 in a plane of the wafer W, and the X-axis along a direction normal to the plane ofFIG. 1 in the plane of the wafer W. - Referring to
FIG. 1 , the exposure apparatus EA has an illumination apparatus IL, a mask stage MS supporting a mask M, a projection optical system PL, and a wafer stage WS supporting the wafer W. The illumination apparatus IL has alight source 1 and a spatial light modulation unit 3 arranged in the order named along the optical axis AX of the exposure apparatus EA. The exposure apparatus EA is configured to illuminate the mask M by means of the illumination apparatus IL on the basis of light from thelight source 1 and to project an image of a surface with a pattern thereon (first surface) of the mask M, onto a surface on the wafer W (second surface) by means of the projection optical system PL. The illumination apparatus IL, which illuminates the surface with the pattern thereon (first surface) of the mask M with the light supplied from thelight source 1, implements modified illumination (off-axis illumination), e.g., dipole, quadrupole, or other illumination by means of the spatial light modulation unit 3. - The illumination apparatus IL has a
polarization control unit 2, a spatial light modulation unit 3, a zoom optical system 4, a fly'seye lens 5, a condenseroptical system 6, an illumination field stop (mask blind) 7, and a field stop imagingoptical system 8 along the optical axis AX. - The spatial light modulation unit 3 forms a desired pupil luminance distribution (pupil intensity distribution) in its far field (Fraunhofer diffraction region), based on the light from the
light source 1 having traveled through thepolarization control unit 2. Aspatial light modulator 3 a of the spatial light modulation unit 3 is composed of a large number of mirror elements as described below, and the illumination apparatus IL also has acontrol unit 10 which outputs a control signal for controlling inclinations of these mirror elements, to thespatial light modulator 3 a. - The
polarization control unit 2 is disclosed, for example, in U.S. Patent Published Application No. 2006/0055834A1. The teachings of the U.S. Patent Published Application No. 2006/0055834A1 are incorporated by reference. - The fly's
eye lens 5 divides the wavefront of incident light and forms a secondary light source consisting of light source images as many as lens elements thereof on the rear focal plane of the fly'seye lens 5. The fly'seye lens 5 applicable herein is, for example, a cylindrical micro fly's eye lens. Such a cylindrical micro fly's eye lens is disclosed, for example, in U.S. Pat. No. 6,913,373. The teachings of the U.S. Pat. No. 6,913,373 are incorporated by reference. - In the exposure apparatus EA of the present embodiment, the mask M disposed on an illumination target surface is subjected to Köhler illumination, using the secondary light source formed by the fly's
eye lens 5, as a light source. Therefore, the plane where this secondary light source is formed becomes a plane conjugate with an aperture stop of the projection optical system PL and thus can be called an illumination pupil plane of the illumination apparatus IL. Typically, the illumination target surface (the surface where the mask M is arranged or the surface where the wafer W is arranged) becomes an optical Fourier transform surface with respect to the illumination pupil plane. - The pupil luminance distribution (which is also referred to as a pupil intensity distribution) is a light intensity distribution on the illumination pupil plane of the illumination apparatus IL or on a plane conjugate with the illumination pupil plane. However, when the number of wavefront divisions by the fly's
eye lens 5 is large, there is a high correlation between the global light intensity distribution formed on the entrance plane of the fly'seye lens 5 and the global light intensity distribution of the entire secondary light source, and, therefore, the light intensity distributions on the entrance plane of the fly'seye lens 5 and on the plane conjugate with the entrance plane can also be called pupil luminance distributions. - The condenser
optical system 6 condenses beams of light emitted from the fly'seye lens 5 and thereafter the condensed beams illuminate theillumination field stop 7 in a superimposed manner. The light from theillumination field stop 7 travels through the field stop imagingoptical system 8 to reach the mask M with the predetermined pattern thereon and to form an illumination region as an image of an aperture of theillumination field stop 7 in at least a part of the pattern-formed region of the mask M.FIG. 1 is depicted without any path bending mirror for bending the optical axis AX, but it is possible to arrange a path bending mirror or path bending mirrors as occasion may demand. The mask M is mounted on the mask stage MS. - The projection optical system PL forms an image of the first surface on a projection surface (second surface) Wa of the wafer W mounted on the wafer stage WS, based on light from the illumination region formed on the pattern surface (first surface) of the mask M by the illumination apparatus IL.
- In this manner, one-shot exposure or scan exposure is carried out while two-dimensionally driving and controlling the wafer stage WS and, therefore, two-dimensionally driving and controlling the wafer W, in the plane (X-Y plane) perpendicular to the optical axis AX of the projection optical system PL. This causes the pattern of the mask M to be sequentially transferred into each of exposure areas on the wafer W.
- The configuration of the spatial light modulation unit 3 will be described below with reference to
FIGS. 2 and 3 .FIG. 2 is an optical path diagram showing the spatial light modulation unit 3 and zoom optical system 4 shown inFIG. 1 .FIG. 3A is a partial perspective view of the spatiallight modulator 3 a in the spatial light modulation unit 3,FIG. 3B is a drawing for explaining parameters for control on the postures of the mirror elements,FIG. 3C is a partial perspective view showing one of the mirror elements in the spatiallight modulator 3 a, andFIG. 3D is a drawing showing a cross section along line I-I of the mirror element shown inFIG. 3C . It is noted thatFIGS. 2 and 3 are depicted without hatching for sections, for easier viewing. - As shown in
FIG. 2 , the spatial light modulation unit 3 has aprism 3 b, and the reflective spatiallight modulator 3 a attached integrally to theprism 3 b. Theprism 3 b is made of a glass material, e.g., fluorite. Theprism 3 b is of a shape in which one side face of a rectangular parallelepiped is depressed in a V-shaped wedge form, and is also called a K prism. In theprism 3 b, one side face of the rectangular parallelepiped part is composed of two planes PS1, PS2 (first and second planes PS1, PS2) intersecting at an obtuse angle as an intersecting line (straight line) P1 a between them subsides inside. The spatiallight modulator 3 a is attached onto a side face of theprism 3 b facing both of these two side faces in contact at the intersecting line P1 a. The optical material forming the base of the spatiallight modulator 3 a is not limited to fluorite, but it may be silica glass or other optical glass. - The two side faces (the sides facing each other) in contact at the intersecting line P1 a function as first and second reflecting surfaces R11, R12. Therefore, the first reflecting surface R11 is located on the first plane PS1. The second reflecting surface R12 is located on the second plane PS2 intersecting with the first plane PS1. The angle between the first and second reflecting surfaces R11, R12 is an obtuse angle.
- The angles herein may be determined, for example, as follows: the angle between the first and second reflecting surfaces R11, R12 is 120°; the angle between the side face (entrance plane IP) of the prism P1 perpendicular to the optical axis AX, and the first reflecting surface R11 is 60°; the angle between the side face (exit plane OP) of the prism P1 perpendicular to the optical axis AX, and the second reflecting surface R12 is 60°.
- The
prism 3 b is so arranged that the side face to which the spatiallight modulator 3 a is attached is parallel to the optical axis AX, that the first reflecting surface R11 is located on thelight source 1 side (upstream in the exposure apparatus EA), and that the second reflecting surface R12 is located on the fly'seye lens 5 side (downstream in the exposure apparatus EA). Therefore, the first reflecting surface R11 of theprism 3 b is obliquely arranged with respect to the optical axis AX of the exposure apparatus EA, as shown inFIG. 2 . The second reflecting surface R12 of theprism 3 b is also obliquely arranged with an opposite inclination to the first reflecting surface R11 with respect to the optical axis AX of the exposure apparatus EA, as shown inFIG. 2 . - The first reflecting surface R11 of the
prism 3 b reflects light incident in parallel with the optical axis AX of the exposure apparatus EA. The spatiallight modulator 3 a is arranged in the optical path between the first reflecting surface R11 and the second reflecting surface R12 and reflects the light reflected on the first reflecting surface R11. The second reflecting surface R12 of theprism 3 b reflects the light reflected on the spatiallight modulator 3 a. This light from the reflecting surface R12 is emitted, specifically, into the zoom optical system 4 in the illumination apparatus IL of the exposure apparatus EA. - Therefore, the intersecting line P1 a being a ridge line formed by the first and second planes PS1, PS2 is located on the spatial
light modulator 3 a side with respect to the first and second reflecting surfaces R11, R12. - The
prism 3 b in this embodiment is integrally formed of one optical block, but theprism 3 b may be constructed using a plurality of optical blocks. - The spatial
light modulator 3 a applies spatial modulation to the incident light, according to a position where the light reflected on the first reflecting surface R11 is incident. This spatiallight modulator 3 a, as described below, includes a large number of microscopic mirror elements SE1 arranged two-dimensionally on a predetermined plane. - For this reason, the light beam incident to the spatial
light modulator 3 a travels, for example, as follows: a ray L1 impinges upon a mirror element SE1 a out of the plurality of mirror elements SE1 of the spatiallight modulator 3 a ; a ray L2 impinges upon a mirror element SE1 b different from the mirror element SE1 a out of the plurality of mirror elements SE1 of the spatiallight modulator 3 a ; a ray L3 impinges upon a mirror element SE1 c different from the mirror elements SE1 a, SE1 b out of the plurality of mirror elements SE1 of the spatiallight modulator 3 a ; a ray L4 impinges upon a mirror element SE1 d different from the mirror elements SE1 a-SE1 c out of the plurality of mirror elements SE1 of the spatiallight modulator 3 a ; a ray L5 impinges upon a mirror element SE1 e different from the mirror elements SE1 a-SE1 d out of the plurality of mirror elements SE1 of the spatiallight modulator 3 a. The mirror elements SE1 a-SE1 e apply the spatial modulation according to the installation position of their own to the arriving rays L1-L5, respectively.FIG. 2 is depicted with illustration of only the five mirror elements SE1 a-SE1 e, for easier explanation, but the number of mirror elements does not have to be limited to five. - The
prism 3 b is so arranged that an air-equivalent length from the entrance plane IP of theprism 3 b (where the rays L1-L5 are incident) via the mirror elements SE1 a- SE1 e to the exit plane OP of theprism 3 b where the rays are outgoing, is equal to an air-equivalent length from a position corresponding to the entrance plane IP to a position corresponding to the exit plane OP without theprism 3 b in the exposure apparatus EA. An air-equivalent length is an optical path length obtained by reducing an optical path length in an optical system to one in air having the refractive index of 1, and an air-equivalent length in a medium having the refractive index n is obtained by multiplying an optical path length therein by 1/n. - The spatial
light modulator 3 a is arranged near the front focal point of the zoom optical system 4 which can be regarded as a condensing optical system. The light reflected by the mirror elements SE1 a-SE1 e of the spatiallight modulator 3 a and provided with a predetermined angle distribution forms a light intensity distribution at a predetermined position on the rearfocal plane 5 a of the zoom optical system 4. Namely, the zoom optical system 4 is a Fourier transform optical system which converts angles given to the emerging rays by the mirror elements SE1 a-SE1 e of the spatiallight modulator 3 a, into positions on theplane 5 a being the far field (Fraunhofer diffraction region) of the spatiallight modulator 3 a. The zoom optical system 4 applicable herein is, for example, a zoom optical system whose projection is an orthogonal projection. - Referring back to
FIG. 1 , the entrance plane of the fly'seye lens 5 is located near this plane Sa and the light intensity distribution (luminance distribution) of the secondary light source formed by the fly'seye lens 5 is a distribution according to the light intensity distribution formed by the spatiallight modulator 3 a and zoom optical system 4. - The spatial
light modulator 3 a, as shown inFIG. 3A , is a movable multi- mirror including the mirror elements SE1 being a large number of microscopic reflecting elements laid with their reflecting surface of a planar shape up. Each mirror element SE1 is movable and inclination of the reflecting surface thereof, i.e., an angle and direction of inclination of the reflecting surface, is independently controlled by the control unit 10 (posture control of the reflecting surfaces). Each mirror element SE1 can be continuously or discretely rotated by a desired angle of rotation around each of axes along two directions parallel to the reflecting surface thereof and orthogonal to each other. Namely, each mirror element SE1 is so configured that the inclination thereof can be controlled in two dimensions along the reflecting surface thereof. In the case of discrete rotation, a preferred control method is to control the angle of rotation in multiple stages (e.g., . . . , −2.5°, −2.0°, . . . , 0°, +0.5°, . . . , +2.5°, . . .). - The above-described posture control of the reflecting surface for each mirror element SE1 is implemented by adjusting an
angle 0 between a normal to a reference plane of the spatiallight modulator 3 a (z-axis) and a normal to the reflecting surface (z′ axis), as shown inFIG. 3B . The reference plane herein is a plane coincident with the reflecting surface before the posture control, which is an x-y plane defined by an x-axis and a y-axis orthogonal to the normal z′ to the reflecting surface before the posture control. The angle θ between the normal z (z-axis) to the reference plane and the normal z′ to the reflecting surface is given by a rotation angle component θx around the x-axis and a rotation angle component θy around the y-axis, as specific posture control information. Specifically, the rotation angle component θx is an angle between the normal z to the reference plane and the normal z′ to the reflecting surface when the normal z′ is projected onto the y-z plane, and the rotation angle component θy is an angle between the normal z to the reference plane and the normal z′ to the reflecting surface when the normal z′ is projected onto the x-z plane. - In addition, the contour of the mirror elements SE1 is square in this embodiment, but the contour is not limited to it. However, the contour is preferably a shape permitting arrangement without a gap (the closest packing) in terms of light utilization efficiency. The gap between adjacent mirror elements SE1 is preferably set to a necessary minimum level.
-
FIG. 3C is a drawing schematically showing a configuration of one mirror element out of the plurality of mirror elements SE1 of the spatiallight modulator 3 a and, more specifically, a drawing schematically showing a drive unit for controlling the posture of the reflecting surface in the mirror element SE1.FIG. 3D is a drawing showing a cross section of the mirror element SE1 along line I-I shown inFIG. 3C . InFIGS. 3C and 3D , the mirror element SE1 has abase 30, asupport 31 disposed on thisbase 30, aplate member 32 connected to thesupport 31 on the opposite side to thebase 30, a reflectingsurface 33 consisting of a reflecting film formed on thisplate member 32, and four electrodes 34 a-34 d arranged so as to surround thesupport 31 on thebase 30. - The
plate member 32 is inclinable around two axes (x-axis and y-axis) orthogonal to each other on a plane parallel to the base 30 with a fulcrum at a joint to thesupport 31. Then potentials are given to the electrodes 34 a-34 d arranged at respective positions on the base side corresponding to the four corners of theplate member 32, to generate an electrostatic force between each electrode 34 a-34 d and theplate member 32, thereby varying the gap between each electrode 34 a-34 d and the plate member 32 (drive unit). This causes theplate member 32 to be inclined on the fulcrum of thesupport 31 and, therefore, the reflectingsurface 33 formed on theplate member 32 is inclined. - Now, multilevel control of the light intensity distribution (pupil luminance distribution) formed on the illumination pupil plane will be explained referring back to
FIG. 2 . In the state of the spatiallight modulator 3 a shown inFIG. 2 , the mirror elements are arranged as follows: among the five mirror elements SE1 a-SE1 e, each of the three mirror elements SE1 a, SE1 c, SE1 e is inclined by a first angle (θx1, θy1) with respect to the reference plane of the spatiallight modulator 3 a ; each of the two mirror elements SE1 b, SE1 d is inclined by a second angle (θx2, θy2) different from the first angle with respect to the reference plane of the spatiallight modulator 3 a. - Accordingly, the reference plane of the spatial
light modulator 3 a (cf.FIG. 3B ) means a plane in which the large number of mirror elements SE1 of the spatiallight modulator 3 a are two-dimensionally arranged. The first angle and second angle are defined using rotation directions θx, θy around the rotation axes of two axes (x-axis and y-axis) orthogonal in the foregoing plane, as shown inFIG. 3B . - The rays L1, L3, L5 reflected on the three mirror elements SE1 a, SE1 c, SE1 e of the spatial
light modulator 3 a are reflected on the second reflecting surface R12 of theprism 3 b and thereafter are condensed by the zoom optical system 4. As a consequence, the rays L1, L3, L5 arrive at a point P1 on the rear focal plane Sa of the zoom optical system 4. On the other hand, the rays L2, L4 reflected on the two mirror elements SE1 b, SE1 d of the spatiallight modulator 3 a are reflected on the second reflecting surface R12 of theprism 3 b and thereafter are condensed by the zoom optical system 4. As a consequence, the rays L2, L4 arrive at a point P2 on the rearfocal plane 5 a of the zoom optical system 4. - In this manner, the rays from the three mirror elements SE1 a, SE1 c, SE1 e are focused at the point P1, while the rays from the two mirror elements SE1 b, SE1 d are focused at the point P2. As a result, a ratio of the light intensity at the point P1 to the light intensity at the point P2 is 3:2. Based on such relationship between the numbers of mirror elements and the light intensity ratio, the light intensity at a predetermined point (P1 or P2) is determined according to the number of reflecting surfaces (SE1 a, SE1 c, SE1 e or SE1 b, SE1 d) contributing to rays (L1, L3, L5 or L2, L4) arriving at the predetermined point (P1 or P2) on the rear
focal plane 5 a of the zoom optical system 4 which can be regarded as the illumination pupil plane. Namely, the light intensity distribution on theplane 5 a can be controlled to a desired distribution. In the configuration example shown inFIG. 2 , the light intensity distribution (pupil luminance distribution) formed on theplane 5 a is one in which the light intensity at the point P1 is 3, the light intensity at the point P2 is 2, and the light intensity in the other region is 0. - Therefore, when the control unit 10 (cf.
FIG. 1 ) to perform the posture control in the spatiallight modulator 3 a is configured to control the number of reflecting surfaces contributing to arriving light, for each point (e.g., P1 or P2) forming the light intensity distribution formed on theplane 5 a, the light intensity at the predetermined point (P1 or P2) on theplane 5 a can be set at a desired value and, in turn, the light intensity distribution on theplane 5 a can be optionally controlled on a multilevel basis. - Since in this embodiment the zoom optical system 4 has the optical Fourier transform action, the rays are superimposed at one point P1 on the rear
focal plane 5 a of the zoom optical system 4 even though the inclinations of the three mirror elements SE1 a, SE1 c, SE1 e are the same first angle (θx1, θy1); and the rays are also superimposed at one point P2 on the rearfocal plane 5 a of the zoom optical system 4 even though the inclinations of the two mirror elements SE1 b, SE1 d are the same second angle (θx2, θy2). In this embodiment, as described above, the inclinations of the reflecting surfaces contributing to light arriving at a certain point on theplane 5 a are controlled not to different inclinations, but to the same inclination (the same posture). - In this embodiment, the angle information of light caused by inclinations of the mirror elements SE1 of the spatial
light modulator 3 a is converted into position information on theplane 5 a being a Fourier transform plane, by the optical Fourier transform action of the zoom optical system 4. Conversely, angle information of light on theFourier transform plane 5 a is converted into position information on the arrangement plane of the mirror elements SE1 of the spatiallight modulator 3 a. As a result, the divergence angle (NA) of beams reaching theplane 5 a which can be regarded as the illumination pupil plane is effectively prevented from varying in theplane 5 a. In addition, selection of settings of mirror elements and inclinations thereof can be done without any restrictions on which mirror element SE1 should be set at which inclination out of the plurality of mirror elements SE1, for setting the light intensity distribution (pupil luminance distribution) formed on theplane 5 a, to a desired distribution. - For example, it is also possible to adopt a method of grouping the plurality of mirror elements SE1 of the spatial
light modulator 3 a into a plurality of mirror element groups 35 a-35 i and letting the mirror element groups 35 a-35 i form their respective light intensity distributions (pupil luminance distributions) on theplane 5 a, as shown inFIG. 4 . It is also possible to adopt another method of assigning the plurality of mirror elements SE1 of the spatiallight modulator 3 a completely at random. -
FIGS. 5A and 5B are drawings for schematically explaining another example of the method for multilevel control of the pupil intensity distribution. Specifically,FIG. 5A is a matrix showing an example of the light intensity distribution (pupil intensity distribution) of 4-valued expression where the illumination pupil plane is composed of 15 pixels in 3 rows×5 columns, andFIG. 5B is a drawing for schematically explaining assignment of light necessary for obtaining the multilevel light intensity distribution shown inFIG. 5A . - For example, for obtaining the light intensity of the leftmost bottom pixel on the matrix shown in
FIG. 5A , light energies PE1-PE4 from four mirror elements of the spatiallight modulator 3 a are superimposed on the leftmost bottom pixel to obtain intensity 4, as shown inFIG. 5B . Similarly, for obtaining the light intensity of the leftmost top pixel on the matrix shown inFIG. 5A , light energies PE5, PE6 from two mirror elements of the spatiallight modulator 3 a are superimposed on the leftmost top pixel to obtainintensity 2, as shownFIG. 5B . - In this manner, it becomes feasible to control the value of light intensity at a predetermined point on the
plane 5 a in multiple levels (four levels in the case ofFIGS. 5A and 5B ), by controlling the number of reflecting surfaces contributing to light arriving at the predetermined point on theplane 5 a. - The example shown in
FIGS. 5A and 5B showed the division of 15 pixels of 3×5 pixels for the illumination pupil plane in order to simplify the description, but the number of divisions of the illumination pupil plane does not have to be limited to 15, and may be a larger number of divisions, e.g., 40×40 pixels, 128×128 pixels, and so on. Furthermore, the example shown inFIGS. 5A and 5B showed the multilevel expression of the light intensity distribution formed on the illumination pupil plane, based on the multiple values of four levels, but the multilevels do not have to be limited to the four levels, and can be any of various numbers of levels according to need, e.g., three levels, eight levels, and so on. - When the total number of reflecting surfaces necessary for formation of the desired light intensity distribution on the illumination pupil plane is not equal to the total number of mirror elements SE1 of the spatial
light modulator 3 a illuminated with the light from the light source 1 (which will be referred to hereinafter as an effective number of mirror elements), specifically, when there is a remainder when the effective number of mirror elements is divided by the total number of reflecting surfaces necessary for formation of the pupil intensity distribution on the illumination pupil plane, it is preferable that the light reflected on the remaining reflecting surfaces be directed to the region other than the illumination pupil plane. - When the light reflected on the remaining reflecting surfaces is averagely scattered over the light intensity distribution formed on the illumination pupil plane, intensity unevenness will occur in this light intensity distribution. For example, let the effective number of mirror elements be 169760 and the total number of reflecting surfaces necessary for formation of the light intensity distribution be 12861; then the remainder is 2567. Namely, the number of mirror elements regarded as one reflecting surface is 13 (169760=12861×13+2567) and light reflected from these thirteen mirror elements arrives at one point on the illumination pupil plane.
- Let us suppose that the illumination pupil plane is divided in 128×128 pixels and that reflected light from the remaining mirror elements is also guided to any of pixels forming the effective pupil constituting the light intensity distribution. In this case there are pixels at which reflected light from thirteen mirror elements arrives and pixels at which reflected light from fourteen mirror elements arrives, in the effective pupil. In this example, the intensity unevenness of the light intensity distribution formed on the illumination pupil plane is given by |(14−13)/(14+13)|=|1/27|, or ±3.7% (=±(1/27)×100). On the other hand, since the rate of the remainder to the effective number of mirror elements is 1.5% (=(2567/169760)×100), a reduction in illuminance on the entire effective pupil is just 1.5% even in the case where the reflected light from the 2567 remaining mirror elements is guided to the outside region of the effective pupil. Therefore, when the reflected light from the 2567 remaining mirror elements is intentionally guided to the region other than the effective region, the intensity unevenness of the light intensity distribution formed on the illumination pupil plane can be reduced by 3.7%.
- In the above embodiment, the spatial light modulator with the plurality of optical elements arranged two-dimensionally and controlled individually had the structure in which each optical element was supported so as to be inclinable on a fulcrum at one support in the center thereof. However, it is also possible to adopt a structure in which each of the optical elements in the spatial light modulator is supported in the peripheral region.
- In the above embodiment, the spatial light modulator in which the orientations (inclinations) of the reflecting surfaces arranged two-dimensionally can be individually controlled is used as the spatial light modulator with the plurality of optical elements arranged two-dimensionally and controlled individually. However, without having to be limited to this, it is also possible, for example, to use a spatial light modulator in which heights (positions) of the reflecting surfaces arranged two-dimensionally can be individually controlled. Such a spatial light modulator applicable herein is, for example, one selected from those disclosed in Japanese Patent Application Laid-open No. 6-281869 and U.S. Pat. No. 5,312,513 corresponding thereto, and in
FIG. 1d of Japanese Patent Application Laid-open (Translation of PCT Application) No. 2004-520618 and U.S. Pat. No. 6,885,493 corresponding thereto. The teachings of the U.S. Pat. Nos. 5,312,513 and 6,885,493 are incorporated by reference. These spatial light modulators are able to apply the same action as a diffracting surface, to incident light by forming a two-dimensional height distribution therein. In this case, the control unit may be configured to control the number of depressions and projections of the reflecting surfaces in the spatial light modulator (the posture control of the reflecting surfaces in the spatial light modulator by the control unit). - The aforementioned spatial light modulator with the plurality of reflecting surfaces arranged two-dimensionally may be modified, for example, according to the disclosure in Japanese Patent Application Laid-open (Translation of PCT Application) No. 2006-513442 and U.S. Pat. No. 6,891,655 corresponding thereto, or according to the disclosure in Japanese Patent Application Laid-open (Translation of PCT Application) No. 2005-524112 and U.S. Patent Published Application No. 2005/0095749 corresponding thereto. The teachings of the U.S. Pat. No. 6,891,655 and the U.S. Patent Published Application No. 2005/0095749 are incorporated by reference.
- In the above-described embodiment and modification examples, the apparatus may be modified so that in the formation of the light intensity distribution (pupil luminance distribution) on the illumination pupil plane using the spatial light modulator 3, the light intensity distribution formed is measured with a light intensity distribution measuring device (pupil luminance distribution measuring device) and the spatial light modulator 3 is controlled according to the result of the measurement. Such technology is disclosed, for example, in Japanese Patent Application Laid-open No. 2006-54328 and in Japanese Patent Application Laid-open No. 2003-22967 and U.S. Patent Published Application No. 2003/0038225 corresponding thereto. The teachings of the U.S. Patent Published Application No. 2003/0038225 are incorporated by reference.
- In the aforementioned embodiment, the mask can be replaced with a variable pattern forming device which forms a predetermined pattern on the basis of predetermined electronic data. The variable pattern forming device applicable herein is, for example, a spatial light modulator including a plurality of reflecting elements driven based on predetermined electronic data. The exposure apparatus with such a spatial light modulator is disclosed, for example, in Japanese Patent Application Laid-open No. 2004-304135 and International Publication WO 2006/080285 and U.S. Pat. Published Application No. 2007/0296936 corresponding thereto. The teachings of the U.S. Pat. Published Application No. 2007/0296936 are incorporated by reference. Besides the reflective spatial light modulators of the non-emission type, it is also possible to use a transmissive spatial light modulator or a self-emission type image display device.
- In the foregoing embodiment, it is also possible to apply a technique of filling the interior of the optical path between the projection optical system and the photosensitive substrate with a medium having the refractive index larger than 1.1 (typically, a liquid), which is so called a liquid immersion method. In this case, it is possible to adopt one of the following techniques as a technique of filling the interior of the optical path between the projection optical system and the photosensitive substrate with the liquid: the technique of locally filling the optical path with the liquid as disclosed in International Publication WO99/49504; the technique of moving a stage holding the substrate to be exposed, in a liquid bath as disclosed in Japanese Patent Application Laid-open No. 6-124873; the technique of forming a liquid bath of a predetermined depth on a stage and holding the substrate therein as disclosed in Japanese Patent Application Laid-open No. 10-303114, and so on. The teachings of the International Publication WO99/49504, and the Japanese Patent Application Laid-open Nos. 6-124873 and 10-303114 are incorporated by reference.
- The exposure apparatus of the foregoing embodiment is manufactured by assembling various sub-systems containing their respective components as set forth in the scope of claims in the present application, so as to maintain predetermined mechanical accuracy, electrical accuracy, and optical accuracy. For ensuring these various accuracies, the following adjustments are carried out before and after the assembling: adjustment for achieving the optical accuracy for various optical systems; adjustment for achieving the mechanical accuracy for various mechanical systems; adjustment for achieving the electrical accuracy for various electrical systems. The assembling blocks from the various sub-systems into the exposure apparatus include mechanical connections, wire connections of electric circuits, pipe connections of pneumatic circuits, etc. between the various sub-systems. It is needless to mention that there are assembling blocks of the individual sub-systems, before the assembling blocks from the various sub-systems into the exposure apparatus. After completion of the assembling blocks from the various sub-systems into the exposure apparatus, overall adjustment is carried out to ensure various accuracies as the entire exposure apparatus. The manufacture of exposure apparatus is desirably performed in a clean room in which the temperature, cleanliness, etc. are controlled.
- The following will describe a device manufacturing method using the exposure apparatus according to the above-described embodiment.
FIG. 6 is a flowchart for explaining manufacturing blocks of semiconductor devices, as the device manufacturing method according to an embodiment of the present invention. As shown inFIG. 6 , the manufacturing blocks of semiconductor devices include depositing a metal film on a wafer W to become a substrate of semiconductor devices (block S40) and applying a photoresist as a photosensitive material onto the deposited metal film (block S42). The subsequent blocks include transferring a pattern formed on a mask (reticle) M, into each shot area on the wafer W, using the exposure apparatus (projection exposure apparatus) of the foregoing embodiment (block S44: exposure block), and developing the wafer W after completion of the transfer, i.e., developing the photoresist to which the pattern has been transferred (block S46: development block). Thereafter, using the resist pattern made on the surface of the wafer W in block S46, as a mask, processing such as etching is carried out on the surface of the wafer W (block S48: processing block). - The resist pattern herein is a photoresist layer in which depressions and projections are formed in a shape corresponding to the pattern transferred by the projection exposure apparatus of the foregoing embodiment and which the depressions penetrate throughout. Step S48 is to process the surface of the wafer W through this resist pattern. The processing carried out in block S48 includes, for example, at least either etching of the surface of the wafer W or deposition of a metal film or the like. In block S44, the projection exposure apparatus of the foregoing embodiment performs the transfer of the pattern onto the wafer W coated with the photoresist, as a photosensitive substrate or plate P.
-
FIG. 7 is a flowchart for explaining manufacturing blocks of a liquid crystal device such as a liquid-crystal display device, as the device manufacturing method according to another embodiment of the present invention. As shown inFIG. 7 , the manufacturing blocks of the liquid crystal device include sequentially performing a pattern forming block (block S50), a color filter forming block (block S52), a cell assembly block (block S54), and a module assembly block (block S56). - The pattern forming block of block S50 is to form predetermined patterns such as a circuit pattern and an electrode pattern on a glass substrate coated with a photoresist, as a plate P, using the projection exposure apparatus of the foregoing embodiment. This pattern forming block includes an exposure block of transferring a pattern to a photoresist layer, using the aforementioned projection exposure apparatus, a development block of performing development of the plate P onto which the pattern has been transferred, i.e., development of the photoresist layer on the glass substrate, and then making the photoresist layer in the shape corresponding to the pattern, and a processing block of processing the surface of the glass substrate through the developed photoresist layer.
- The color filter forming block of block S52 is to form a color filter in which a large number of sets of three dots corresponding to R (Red), G (Green), and B (Blue) are arrayed in a matrix pattern, or in which a plurality of filter sets of three stripes of R, G, and B are arrayed in a horizontal scan direction.
- The cell assembly block of block S54 is to assemble a liquid crystal panel (liquid crystal cell), using the glass substrate on which the predetermined pattern has been formed in block S50, and the color filter formed in block S52. Specifically, for example, a liquid crystal is poured into between the glass substrate and the color filter to form the liquid crystal panel. The module assembly block of block S56 is to attach various components such as electric circuits and backlights for display operation of this liquid crystal panel, to the liquid crystal panel assembled in block S54.
- An embodiment of the present invention is not limited only to the application to the exposure apparatus for manufacture of semiconductor devices, but can also be widely applied, for example, to the exposure apparatus for the liquid-crystal display devices formed with rectangular glass plates, or for display devices such as plasma displays, and to the exposure apparatus for manufacture of various devices such as imaging devices (CCDs and others), micromachines, thin-film magnetic heads, and DNA chips. Furthermore, an embodiment of the present invention is also applicable to the exposure block (exposure apparatus) for manufacture of masks (photomasks, reticles, etc.) with mask patterns of various devices thereon, by the photolithography process.
- In the above-described embodiment, the light (exposure light) supplied by the
light source 1 can be an ArF excimer laser light (wavelength: 193 nm) or a KrF excimer laser light (wavelength: 248 nm). However, without having to be limited to this, it is also possible to use any other appropriate laser light source, e.g., an F2 laser light source which supplies laser light at the wavelength of 157 nm. - The aforementioned embodiment was the application of the present invention to the illumination optical system illuminating the mask in the exposure apparatus, but, without having to be limited to this, an embodiment of the present invention can also be applied to a generally-used illumination optical system which illuminates an illumination target surface except for the mask.
- As described above, an embodiment of the present invention successfully provides the multilevel pupil luminance distribution (pupil intensity distribution) in which luminances in respective zones are optionally controlled.
- As described above, the present invention can be modified in various ways without departing from the scope and spirit of the present invention, without having to be limited to the above embodiments.
Claims (1)
1. An illumination apparatus which illuminates an illumination target surface with light from a light source, the illumination apparatus comprising:
a spatial light modulator with a plurality of reflecting surfaces arranged two- dimensionally, postures of the respective reflecting surfaces being controlled independently of each other;
a first condensing optical system configured to condense light from the plurality of reflecting surfaces of the spatial light modulator onto a predetermined surface in an optical path of the illumination apparatus;
a fly's eye optical system with a plurality of optical surfaces arranged two- dimensionally on the predetermined surface, configured to form a light intensity distribution on an illumination pupil plane by light from the first condensing optical system; and
a controller configured to control the plurality of reflecting surfaces of the spatial light modulator, wherein
the controller controls postures of the plurality of reflecting surfaces so that light from a first reflecting surface and light from a second reflecting surface different from the first reflecting surface overlap on the predetermined surface after passing through the first condensing optical system, both the first and second reflecting surfaces being included in the plurality of reflecting surfaces.
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US14/664,576 US9678332B2 (en) | 2007-11-06 | 2015-03-20 | Illumination apparatus, illumination method, exposure apparatus, and device manufacturing method |
US15/599,017 US20170255005A1 (en) | 2007-11-06 | 2017-05-18 | Illumination apparatus, illumination method, exposure apparatus, and device manufacturing method |
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