A strategy of efficient laser emission with resonant feedback based on a microemulsion comprising of a Blue-Phase Liquid Crystal (BPLC), laser dye and block copolymer is presented here. BPLCs are produced and confined in microspheres with a microfluidic apparatus. These spatially assembled dye doped BPLC microdroplets are used to generate laser light. The topologically directed assemblies of BPLC microspheres with specific shape and symmetry are essential for reducing threshold and increasing Q-factor of laser emission. These results provide new avenues for a wide range of photonic applications.
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.
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