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Cholesteric Liquid Crystal Materials for Tunable Diffractive Optics
Advanced Optical Materials ( IF 9 ) Pub Date : 2018-06-03 , DOI: 10.1002/adom.201800335
Alexander Ryabchun 1 , Alexey Bobrovsky 2
Affiliation  

Modern optics and photonics constantly require break‐through materials and designs in order to achieve miniature, lightweight, highly tunable, and effective optical devices. One of the basic optical components is the diffraction grating (DG), widely used for the dispersion of light, beam steering, etc. This review gathers research efforts on diffractive optical elements based on cholesteric liquid crystal (CLC) materials with a supramolecular helical architecture. All main types and fabrication approaches of periodic diffractive structures from CLCs are classified and described. Key optical properties of DGs, their advantages and drawbacks are considered. Special attention is paid on the tunability of DGs including design principles and prospective chiral materials. The review consists of three parts divided according to the formation mechanism of diffractive structures: i) the spontaneously formed periodic structures from CLCs confined in cells with hybrid or homeotropic boundary conditions; ii) DGs generated by external electric field applied to CLCs layers; iii) light‐generated DGs (e.g., obtained by holography, mask exposure, photoalignment). The review also aims to initiate and gain collaborations between physicists, engineers and organic chemists to combine novel chiral photoswitches and molecular motors with sophisticated optical design paving the way towards novel smart optical materials.

中文翻译:

用于可调衍射光学的胆甾型液晶材料

现代光学和光子学不断需要突破性的材料和设计,以实现微型,轻便,高度可调和有效的光学设备。基本的光学组件之一是衍射光栅(DG),它广泛用于光的散射,光束转向等。本文综述了基于具有超分子螺旋结构的胆甾型液晶(CLC)材料的衍射光学元件的研究成果。 。对来自CLC的周期性衍射结构的所有主要类型和制造方法进行了分类和描述。考虑了DG的关键光学特性,其优缺点。特别关注DG的可调性,包括设计原则和预期的手性材料。综述根据衍射结构的形成机理分为三个部分:i)由CLCs自发形成的周期性结构,局限在混杂或同向边界条件下的细胞中;ii)由施加到CLC层的外部电场产生的DG;iii)光产生的DG(例如,通过全息照相,掩模曝光,光取向获得)。审查的目的还在于在物理学家,工程师和有机化学家之间发起并获得合作,以将新型手性光电开关和分子马达与复杂的光学设计相结合,从而为新型智能光学材料铺平道路。iii)光产生的DG(例如,通过全息照相,掩模曝光,光取向获得)。审查的目的还在于在物理学家,工程师和有机化学家之间发起并获得合作,以将新型手性光电开关和分子马达与复杂的光学设计相结合,从而为新型智能光学材料铺平道路。iii)光产生的DG(例如,通过全息照相,掩模曝光,光取向获得)。审查的目的还在于在物理学家,工程师和有机化学家之间发起并获得合作,以将新颖的手性光电开关和分子马达与复杂的光学设计相结合,从而为新型智能光学材料铺平道路。
更新日期:2018-06-03
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