Zhu Shuangqi, Xu Zhentao, Zhang Hao, Yang Keyang, Wang Ning, Liu Haitao, Wang Yongtian, Xia Jun, Huang Lingling
Opt Express. 2021 Mar 15;29(6):9553-9564. doi: 10.1364/OE.419914.
The ultimate goal of metasurface research in recent years is to apply metasurface to reality applications and improve the performance compared to its counterpart, namely conventional optical elements with the same function. Inspired by the application of electrically addressing spatial light modulator (EA-SLM) and based on the binary holographic algorithm, here we propose a reconfigurable metadevice integrated with the nematic liquid crystal (NLC). The smart metadevice directly uses the subwavelength antennas as the main contributor to the phase accumulation instead of the NLC layer. By applying different electrical modulation patterns on the NLC, the metadevice can realize the function of dynamic holographic display as traditional SLMs but features in smaller size, higher resolution and lager field of view. In addition, we improved the existing computer-generated hologram algorithm to generate three holograms with quantitative correlation and also propose a new optical encryption method based on our metadevice. The encryption method needs four elements in total to decrypt and can fully meets the requirements of the various encrypted content. We believe such metadevice paves the way for the new generation of micro-optical display and optical encryption devices.
近年来超表面研究的最终目标是将超表面应用于实际应用中，并与具有相同功能的传统光学元件相比提高其性能。受电寻址空间光调制器（EA-SLM）应用的启发，并基于二元全息算法，我们在此提出一种集成了向列型液晶（NLC）的可重构超器件。该智能超器件直接使用亚波长天线作为相位积累的主要贡献者，而不是NLC层。通过在NLC上施加不同的电调制图案，该超器件可以实现传统SLM的动态全息显示功能，但具有更小的尺寸、更高的分辨率和更大的视场。此外，我们改进了现有的计算全息算法以生成具有定量相关性的三个全息图，并基于我们的超器件提出了一种新的光学加密方法。该加密方法总共需要四个元素来解密，并且可以完全满足各种加密内容的要求。我们相信这样的超器件为新一代微光学显示和光学加密设备铺平了道路。
