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30 May 2022 High steering resolution design of pancharatnam phase based optical laser beam steering device
Brandon Vreeland, Andre Rynbach, Philip Bos
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Proceedings Volume PC12092, Laser Technology for Defense and Security XVII; PC120920O (2022) https://doi.org/10.1117/12.2633937
Event: SPIE Defense + Commercial Sensing, 2022, Orlando, Florida, United States
Abstract
A new design is developed for a non-mechanical, tunable Pancharatnam phase based optical beam steering device that drastically improves the steering resolution for large angles (up to 11°). A fringe field switching structure is used to construct a Pancharatnam phase, an in-plane spiral pattern with a given pitch length, in a liquid crystal cell. The pitch length of a Pancharatnam phase device is the length along the aperture corresponding to a phase increase of one wave. A design utilizing neighboring pitch lengths of different sizes achieves a steering angle corresponding to the average length of the neighboring pitches. The alternating pitch length design is advantageous to the resolution of the device because the length of a single pitch is restricted to an integer number of electrodes in the fringe field switching structure. By implementing the new alternating pitch design, the pitch length can change by a smaller non-integer number of electrodes resulting in finer steering.
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Brandon Vreeland, Andre Rynbach, and Philip Bos "High steering resolution design of pancharatnam phase based optical laser beam steering device", Proc. SPIE PC12092, Laser Technology for Defense and Security XVII, PC120920O (30 May 2022); https://doi.org/10.1117/12.2633937
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KEYWORDS
Electrodes
Laser optics
Beam steering
Liquid crystals
Switching
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