There is provided a process for producing an optical element comprising a photonic crystal in which spots having different indices are arranged periodically, comprising the step of exposing an optical medium whose refractive index changes by irradiation of light or by a predetermined treatment conducted...http://www.google.es/patents/US6456416?utm_source=gb-gplus-sharePatente US6456416 - Process and device for producing photonic crystal, and optical element
Process and device for producing photonic crystal, and optical element
