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首页> 外文期刊>Journal of nonlinear optical physics & materials >Nonlinear and electro-optics of nano-dispersed nematic liquid crystals with tunable negative-, zero-, and positive indices
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Nonlinear and electro-optics of nano-dispersed nematic liquid crystals with tunable negative-, zero-, and positive indices

机译：具有可调负，零和正折射率的纳米分散向列液晶的非线性和电光

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摘要

We present a review of recent progress in the studies of the nonlinear- and electro-optics of liquid crystals, particularly in their meta-material forms. An analytical expression for the " ultimate" optical nonlinearity of nematic liquid crystals is obtained, and several routes to realizing such optical nonlinearities are discussed. We also describe two approaches for realizing tunable or reconfigurable negative-zero-positive index materials: ( 1) planar nano-structured frequency selective surfaces [FSS] containing nematic liquid crystals; ( 2) core-shell nano-spheres randomly distributed in bulk nematic liquid crystal matrix. Such metamaterials can be designed for applications in the visible-infrared, as well as Terahertz and microwave regimes. These liquid crystalline meta-materials are capable of supra-nonlinearities characterized by refractive index changing coefficients of over 1 cm(2)/watt and microseconds response times.
机译：我们对液晶的非线性光学和电光学，特别是其超材料形式的研究进展进行了综述。得到了向列型液晶“最终”光学非线性的解析表达式，并讨论了实现这种光学非线性的几种途径。我们还描述了两种实现可调谐或可重构的负零正折射率材料的方法：（1）包含向列型液晶的平面纳米结构的频率选择表面[FSS]; （2）核-壳纳米球随机分布在块状向列液晶基体中。可以将此类超材料设计用于可见红外以及太赫兹和微波领域。这些液晶超材料具有超非线性特性，其折射率变化系数超过1 cm（2）/ watt，响应时间为微秒。

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