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Here we demonstrate the fabrication processes and working parameters of tunable phase retarders based on photoaligned Liquid Crystal (LCs) cells by combining the photo-pattering and self-assembly processes. The proposed LC devices were assembled by Indium Tin Oxide (ITO) transparent conductive layers deposited on a glass and quartz substrates and spin coated with thin polyamide (PI) layer as photo-alignment material. We study the voltagetransmittance and phase retardation behavior of assembled LC cells and demonstrate polarization sensitive spatial patterns, that open promising features for next generation optical elements as waveplates, lenses, phase retarders, etc.
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Nguyen Hong Minh Chau, Chih-Yao Ho, Vera Marinova, Ken Yuh Hsu, Shiuan Huei Lin, "Tunable geometric phase retarders using photo-aligned liquid crystal devices," Proc. SPIE 11774, Holography: Advances and Modern Trends VII, 117740M (7 May 2021); https://doi.org/10.1117/12.2590673