Computational spectropolarimetry with a tunable liquid crystal metasurface  

作　　者：Yibo Ni Chen Chen Shun Wen Xinyuan Xue Liqun Sun Yuanmu Yang 

机构地区：[1]State Key Laboratory of Precision Measurement Technology and Instruments,Department of Precision Instrument,Tsinghua University,Beijing 100084,China

出　　处：《eLight》2022年第1期291-300,共10页e光学（英文）

基　　金：National Natural Science Foundation of China(61975251,62135008);Guoqiang Institute,Tsinghua University。

摘　　要：While conventional photodetectors can only measure light intensity,the vectorial light field contains much richer information,including polarization and spectrum,that are essential for numerous applications ranging from imaging to telecommunication.However,the simultaneous measurement of multi-dimensional light field information typically requires the multiplexing of dispersive or polarization-selective elements,leading to excessive system complexity.Here,we demonstrate a near-infrared spectropolarimeter based on an electrically-tunable liquid crystal metasurface.The tunable metasurface,which acts as an encoder of the vectorial light field,is tailored to support high-quality-factor guided-mode resonances with diverse and anisotropic spectral features,thus allowing the full Stokes parameters and the spectrum of the incident light to be computationally reconstructed with high fidelity.The concept of using a tunable metasurface for multi-dimensional light field encoding may open up new horizons for developing vectorial light field sensors with minimized size,weight,cost,and complexity.

关 键 词：Tunable metasurface Liquid crystal Computational spectropolarimetry 

分 类 号：O43[机械工程—光学工程]