Polarization-independent electrically tunable phase grating fabricated from ultraviolet-curable liquid crystals

摘要

Polarization-independent electrically tunable Raman-Nath phase diffraction grating has been fabricated using a very simple technique involving photocurable liquid crystals. The structure consists of alternating stripe of twisted-nematic liquid crystal domains and polymerized homeotropic ones. The diffraction efficiency can be tuned by an applied electric field, and is independent of the incident polarization particularly slightly above an electric field to make a Frederiks transition.