Multifunctional Liquid Crystal Device for Grayscale Pattern Display and Holography with Tunable Spectral-Response
Multifunctional Liquid Crystal Device for Grayscale Pattern Display and Holography with Tunable Spectral-Response
复制标题
用于灰度图案显示和具有可调谐光谱响应的全息术的多功能液晶器件
DOI：
10.1002/lpor.202100591
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发表时间：
2022-01-23
影响因子：
11
通讯作者：
Lu, Yanqing
中科院分区：
文献类型：
--
作者：
Chen, Kuixian;Xu, Chunting;Lu, Yanqing
传统的液晶器件只能实现对光的振幅或相位的单一控制，这阻碍了液晶器件向超小型多功能集成化方向发展。在此，它表明LC器件可以很容易地扩展到多功能的，而不需要复杂的设计和制造成本。具体而言，通过将Pancharatnam-Berry相位与Malus定律中隐含的取向简并相结合，LC器件的每个操作单元可以分别操纵入射光的振幅和相位，代表了设计创新LC器件的新范式。实验证明了一种多功能液晶器件，可以在液晶表面显示灰度图案，同时在远场投射独立的纯相位全息图像。更有趣的是，随着外部施加电压的LC指向矢倾斜，提供了一个新的自由度来调制LC器件的光谱响应，有助于实现光开关的独特功能。由于这些独特的双重操纵和光谱可调谐的特性，所提出的多功能LC在信息复用，光通信，光谱测量等方面具有广阔的前景。
Conventional liquid-crystal (LC) devices can only realize a single-manipulation of optical amplitude or phase, which hinders the development of LC devices toward ultracompact multifunctional integration. Herein, it is shown LC devices can be readily extended to multifunctional ones without the cost of complex design and fabrication. Specifically, by combining Pancharatnam-Berry phase with orientation-degeneracy implied in Malus's law, each operation-unit of LC devices can manipulate the amplitude and phase of incident light separately, representing a new paradigm for designing innovative LC devices. A multifunctional LC device which can display a grayscale pattern right at the surface of LC, while simultaneously project an independent phase-only holographic image in the far-field is experimentally demonstrated. More interestingly, with the LC directors tilted with external applied voltages, a new degree-of-freedom is provided to modulate the spectral-response of LC devices, contributing to the distinct function of optical switch. Owing to these unique characteristics of dual-manipulations and spectrum-tunability, the proposed multifunctional LCs have promising prospects in information multiplexing, optical communications, spectral measurements, etc.