A method and apparatus that includes a first waveguide segment that differentially changes the amplitude of the light relative to a first polarization orientation, a thickness of oriented liquid crystal or other birefringent material sufficient to delay one polarization component one-half wavelength...http://www.google.es/patents/US7174060?utm_source=gb-gplus-sharePatente US7174060 - Ultra-thin polarization mode converters based on liquid crystal materials
Ultra-thin polarization mode converters based on liquid crystal materials
