Large circular dichroism in the emission from an incandescent metasurface

DESCRIPTION : This repository contains experimental datasets (measured emission spectra) and corresponding processing scripts (Matlab) used in the following paper : Large circular dichroism in the emission from an incandescent metasurface, Optica 2023. =============================== PAPER ABSTRACT: Compact sources in the mid-wave infrared (MWIR) are needed for several applications ranging from spectroscopy to free-space communication. Ultra-thin incandescent metasurfaces are promising candidates, offering the possibility of tuning the emission spectrum, directivity and modulation speed. However, control over polarization remains a challenge, especially when it comes to emission of circularly polarized light. Here, emission of polarized MWIR radiation by a 700 nm thick incandescent chiral metasurface is reported. The degree of polarization is above 0.5 with degree of circular polarization of 0.38 at 5 µm. The metasurface is heated by Joule effect and its emission can be modulated beyond 10 MHz. This paves the way to detection techniques using polarization as an additional degree of freedom.

数据集说明：本仓库包含发表于2023年《Optica》期刊的论文《白炽超表面发射光的大圆二色性》（Large circular dichroism in the emission from an incandescent metasurface）所使用的实验数据集（实测发射光谱）与配套的Matlab处理脚本。
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论文摘要：中波红外（mid-wave infrared, MWIR）波段的紧凑型光源在光谱学、自由空间通信等诸多应用领域中存在广泛需求。超薄白炽超表面是极具前景的候选方案，可实现发射光谱、辐射方向性与调制速率的精准调控，但偏振调控仍是一项核心挑战，尤其针对圆偏振光的发射场景。本文报道了一款厚度仅700纳米的白炽手性超表面，其可产生偏振化的中波红外辐射：在5微米波长处，该超表面的偏振度高于0.5，圆偏振度可达0.38。该超表面通过焦耳效应实现加热，其发射信号的调制带宽可突破10兆赫兹，这一成果为将偏振作为额外自由度的检测技术铺平了道路。

搜集汇总

背景与挑战

背景概述

该数据集包含用于支持论文《Large circular dichroism in the emission from an incandescent metasurface》的实验数据和Matlab处理脚本，主要研究中波红外（MWIR）超薄手性超表面的热发射特性，特别是圆偏振发射，其偏振度超过0.5，圆偏振度达0.38（在5µm波长处），并展示了通过焦耳热实现超过10MHz的调制能力，为纳米光子学和热发射应用提供了关键数据。