Virtual Reality (VR) devices present challenges in terms of vergence-accommodation conflict that lead to visual fatigue for the user over time. Fast switchable liquid crystal (LC) lenses which access multiple focal planes can help to overcome this challenge. The response time for Nematic liquid crystals (NLC) is in the millisecond range, while that of ferroelectric liquid crystals (FLC) in the microsecond order. In this paper we look at recent advances in fast switchable liquid crystal lenses using NLC, FLC or both, compare their design and properties with competing technologies. A discussion on the limitations of each design and technology have also been included.
Due to the high cost and requirement for cryogenic cooling of Mercury Cadmium Telluride (MCT) detectors, there is a growing demand for cheap Long Wavelength Infrared (LWIR) detectors at room temperature. Graphene has shown great potential yet suffers from a low absorption (<3%) in the LWIR ranges. In this presentation, we demonstrate the asymmetric plasmon-assisted hot carrier generation and Seebeck photodetection in nano-patterned Graphene with an enhanced absorption (>60%). This novel Graphene photodetector exhibits a remarkable responsivity of 2900 VW-1, detectivity of 1.1 x 109 Jones with a fast response of 100ns in 8-12 μm band at room temperature.
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