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Pancharatnam Phase Devices (PPDs) are an exciting new area for optical component development. Single layer active devices that provide optical beam steering over a range of several degrees will be discussed. The devices considered here use a comb electrode structure to provide an in-plane electric field to control the optical axis orientation of the liquid crystal director to have the desired spiral pattern of a PPD device. Two basic concepts will be discussed: one that used the in-plane fields to “pin” the only the ends of the spiral pattern; and another that uses sub elements to defines the desired director orientation at several locations in the spiral. The concepts, design details, and modeling results are shown.
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Brandon Vreeland, Comrun Yousefzadeh, Andre VanRynbach, Douglas Bryant, Philip Bos, "Single layer, tunable, liquid crystal based Pancharatnam phase devices," Proc. SPIE 11807, Liquid Crystals XXV, 118070M (2 September 2021); https://doi.org/10.1117/12.2596462