基于片上超表面的多路方向复用全息术  

Directional-multiplexing holography by on-chip metasurface

作　　者：杨睿 于千茜 潘一苇 陈思涵 张宸 叶宏 周鑫尧 时阳阳 万帅 刘阳 李仲阳 Yang Rui;Yu Qianqian;Pan Yiwei;Chen Sihan;Zhang Chen;Ye Hong;Zhou Xinyao;Shi Yangyang;Wan Shuai;Liu Yang;Li Zhongyang(Electronic Information School,Wuhan University,Wuhan,Hubei 430072,China;Wuhan Institute of Quantum Technology,Wuhan,Hubei 430206,China;Suzhou Institute of Wuhan University,Suzhou,Jiangsu 215123,China)

机构地区：[1]武汉大学电子信息学院,湖北武汉430072 [2]武汉量子技术研究院,湖北武汉430206 [3]武汉大学苏州研究院,江苏苏州215123

出　　处：《光电工程》2022年第10期62-71,共10页Opto-Electronic Engineering

基　　金：湖北省杰出青年科学基金资助项目(2021CFA043);武汉市科技局资助项目(2020010601012196);江苏省自然科学基金(BK20220281);武汉大学启动项目(501100007046)。

摘　　要：片上超表面是将超表面引入到集成光波导上以实现对导波的任意调制,它为导波与自由空间光波之间的转换提供了一个方便且通用的平台。尽管之前在片上全息方面已经做出了一些探索,但在扩展编码自由度和多路复用方面仍需突破。本文提出并实验验证了一种基于片上超表面的多路复用全息显示器件。通过迂回相位和几何相位的融合,使片上超表面将导波以圆偏光的形式耦合到自由空间中,以打破此前片上超表面沿传播方向上相位简并的局限性,进一步扩展了编码自由度。同时使用模拟退火相位优化算法和多路复用技术,实现了可独立编码的四通道远场全息显示复用。本文的设计方法以片上超表面的多功能集成,为具有高信息存储容量的集成光通信提供了一种新的途径。The on-chip metasurface is introduced into integrated optical waveguides to achieve arbitrary modulation of guided waves,which provides a convenient and versatile platform for the conversion between guided waves and free-space functions.Despite previous explorations in on-chip holography demonstration,it still faces critical challenges to expand the encoding freedom and multiplexing.Here,we propose and experimentally demonstrate a quad-fold multiplexed holographic display optics device based on an on-chip metasurface.By mixing the detour phase and Pancharatnam-Berry(PB)phase,the on-chip metasurface couples the guided waves into free space in circular polarization,destroying the phase degeneracy that exists in the wavevector directions with only the detour phase.Moreover,by utilizing simulated annealing phase optimization algorithm and multiplexing,we achieved a quad-fold multiplexed far-field holographic display with independent encoding capability.The proposed method in this paper opens up a new prospect for multifunctional integration of on-chip metasurfaces and provides an alternative approach for integrated optical communication with high information storage capacity.

关 键 词：片上超表面 导波 迂回相位 几何相位 多路复用 远场全息 

分 类 号：TB34[一般工业技术—材料科学与工程] O43[机械工程—光学工程]