Large circular dichroism in the emission from an incandescent metasurface

DESCRIPTION :

This repository contains all datasets and MATLAB codes 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：
本仓库包含以下论文所使用的全部数据集与MATLAB代码：
《白炽超表面（metasurface）发射光的巨圆二色性》，发表于Optica 2023年。

=================================

论文摘要：
从光谱学到自由空间通信等诸多应用场景，均需用到中波红外（mid-wave infrared, MWIR）波段的紧凑型光源。超薄白炽超表面是极具潜力的候选器件，可实现发射光谱、辐射方向性与调制速率的灵活调控。然而，对偏振态的精准调控仍存在技术挑战，在圆偏振光发射场景下这一难题尤为突出。
本研究报道了一款厚度为700纳米的手性白炽超表面，其可辐射偏振态可控的中波红外光。在5微米波段处，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，其发射光的调制速率可突破10兆赫兹。这一成果为以偏振态作为额外自由度的探测技术铺平了发展道路。