Journal
OPTICS EXPRESS
Volume 28, Issue 2, Pages 991-1001Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.380952
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Funding
- U.S. Air Force [FA8650-19-C-1834]
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Replacing mechanical optical beam steering devices with non-mechanical electro-optic devices has been a long-standing desire for applications such as space-based communication, LiDAR and autonomous vehicles. While promising progress has been achieved to non-mechanically deflect light with high efficiency over a wide angular range, significant limitations remain towards achieving large aperture beam steering with a tunable steering direction. In this paper, we propose a unique liquid crystal based Pancharatnam Phase Device for beam steering which can provide both tunability and a fast response times in a format scalable to large apertures. This architecture employs a linear array of phase control elements to locally control the orientation of the liquid crystal director into a cycloidal pattern to deflect transmitted light. The PCEs are comprised of a fringe field switching electrode structure that can provide a variable in-plane electric field. Detailed modeling of the proposed design is presented which demonstrates that such a device can achieve a high degree of uniformity as it rotates the LC molecules over the 180 degrees angular range required to create a Pancharatnam phase device. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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