Reflectance dependences of diffraction properties in Fabry-Perot liquid crystal polarization grating

The reflectance dependences of diffraction properties in a Fabry-Perot liquid crystal polarization grating (LCPG) were investigated. The Fabry-Perot LCPG was fabricated by combining two Au films and an orthogonal circular polarization grating (OCPG). The diffraction efficiency of our device strongly depends on the thickness of the Au films while polarization conversion properties are maintained to be the same as these of the general OCPG. Our results clarify that the Fabry-Perot OCPG has the potential to function as a multibranch polarization beam splitter whose diffraction efficiencies of respective diffraction directions are controlled in different ways by changing resonance conditions. (C) 2017 The Japan Society of Applied Physics