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13 March 2024 Optical beam-steering using liquid crystal grating with periodically ultra-violet-light-treated polyimide film
Yuji Tsukamoto, Yoshiaki Ueno, Masanori Ozaki
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Proceedings Volume PC12907, Emerging Liquid Crystal Technologies XIX; PC129070A (2024) https://doi.org/10.1117/12.2688434
Event: SPIE OPTO, 2024, San Francisco, California, United States
Abstract
Flat optics based on liquid crystal (LC), such as diffractive waveplates and LC spatial light modulators, have various applications in astronomy, optical communications, augmented/virtual reality, and LiDAR sensing. These applications demanded that LC flat optics actively controls the modulated wavefront. This study fabricated an LC grating device with periodical pretilt angle distribution by a novel photoalignment method. The photoalignment method uses an ultra-violet-light-treated polyimide alignment film. It was demonstrated that the LC grating could actively control the light propagation direction by the applied voltage. The proposed device comprises a photoalignment layer with gradually changed surface-free energy and flat electrodes on the entire surface without pixels and patterns. The photoalignment can use grey-tone masks, where the transmitted light-intensity profile is distributed. This study provides a suitable method for device fabrication, like in a flat panel display, and the proposed device finds potential applications.
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(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Yuji Tsukamoto, Yoshiaki Ueno, and Masanori Ozaki "Optical beam-steering using liquid crystal grating with periodically ultra-violet-light-treated polyimide film", Proc. SPIE PC12907, Emerging Liquid Crystal Technologies XIX, PC129070A (13 March 2024); https://doi.org/10.1117/12.2688434
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KEYWORDS
Liquid crystals
Flat optics
Optical gratings
Polyimides
Geometrical optics
Control systems
Modulation
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