An incandescent metasurface for quasimonochromatic polarized Mid-Wave Infrared emission modulated beyond 10 MHz

README =============================== DESCRIPTION : This repository contains all datasets and MATLAB codes used in the following paper : Wojszvzyk, Léo, Anne Nguyen, Anne-Lise Coutrot, Cheng Zhang, Benjamin Vest, et Jean-Jacques Greffet. « An Incandescent Metasurface for Quasimonochromatic Polarized Mid-Wave Infrared Emission Modulated beyond 10 MHz ». Nature Communications 12, no 1 (5 mars 2021): 1492. https://doi.org/10.1038/s41467-021-21752-w. In order to run some of the scripts, users need to download the RETICOLO library available at doi : 10.5281/zenodo.3610175 Light-in-complex-nanostrucutres/RETICOLO and subsequently add this library to their MATLAB search path. 4 folders can be found: EM_simulations: contains scripts to reproduce the electromagnetic simulations presented in the paper. The codes use functions in the RETICOLO library (therefore, please make sure that the folder containing all RETICOLO functions (RETICOLO_V8/reticolo_allege) are known to the MATLAB search path). PolarizedFreqResponse: contains raw datasets and ready-to-use analysis scripts to reproduce frequency response curves of the device presented in the paper. The main script to be run is "main.m". EmissivitySpectra: contains raw datasets and ready-to-use analysis scripts to reproduce the emissivity spectrum of the device presented in the paper. Response_to_pulse_simulation: contains raw datasets and ready-to-use analysis scripts to reproduce the pulse response of the device presented in the paper. =============================== PAPER ABSTRACT: Incandescent sources such as hot membranes and globars are widely used for mid infrared spectroscopic applications. The emission properties of these sources can be tailored by means of resonant metasurfaces: control of the spectrum, polarization and directivity has been reported. For detection or communication applications, fast temperature modulation is desirable but is still a challenge due to thermal inertia. Reducing thermal inertia can be achieved using nanoscale structures at the expense of a low absorption and emission cross section. Here, we introduce a metasurface that combines nanoscale heaters to ensure fast thermal response and nanophotonic resonances to provide large monochromatic and polarized emissivity. The metasurface is based on platinum and silicon nitride and can sustain high temperatures. We report a peak emissivity of 0.8 and an operation up to 20 MHz, six orders of magnitude faster than commercially available hot membranes.

README =============================== 数据集说明：
本仓库收录了下述论文中使用的全部数据集与MATLAB代码：
Wojszvzyk, Léo、Anne Nguyen、Anne-Lise Coutrot、Cheng Zhang、Benjamin Vest 及 Jean-Jacques Greffet. 《用于超过10 MHz调制的准单色偏振中波红外（Mid-Wave Infrared）发射的白炽超表面（Incandescent Metasurface）》，《自然-通讯（Nature Communications）》，2021年3月5日，第12卷第1期，第1492页，https://doi.org/10.1038/s41467-021-21752-w。
若要运行部分脚本，用户需下载RETICOLO库（可从DOI：10.5281/zenodo.3610175的Light-in-complex-nanostrucutres/RETICOLO处获取），并将该库添加至MATLAB的搜索路径中。
本仓库包含4个文件夹，分别为：
EM_simulations：包含用于复现论文中电磁仿真（electromagnetic simulations）的脚本。该类脚本依赖RETICOLO库中的函数（请确保包含所有RETICOLO函数的文件夹RETICOLO_V8/reticolo_allege已被添加至MATLAB搜索路径）。
PolarizedFreqResponse：包含原始数据集与可直接运行的分析脚本，用于复现论文中器件的频率响应曲线（frequency response curves）。需运行的主脚本为`main.m`。
EmissivitySpectra：包含原始数据集与可直接运行的分析脚本，用于复现论文中器件的发射光谱（emissivity spectrum）。
Response_to_pulse_simulation：包含原始数据集与可直接运行的分析脚本，用于复现论文中器件的脉冲响应（pulse response）。
=============================== 论文摘要：
热膜、硅碳棒等白炽光源广泛应用于中红外光谱领域。这类光源的发射特性可通过共振超表面（resonant metasurface）进行调控：已有研究实现了对光谱、偏振与辐射方向的精准控制。在检测或通信应用中，实现快速温度调制是理想目标，但受限于热惯性（thermal inertia），该目标仍极具挑战。通过纳米结构可降低热惯性，但会以牺牲吸收与发射截面为代价。本文提出一种超表面，其集成了纳米加热器（nanoscale heaters）以保障快速热响应，同时利用纳米光子共振（nanophotonic resonances）实现高单色偏振发射。该超表面以铂（platinum）与氮化硅（silicon nitride）为基材，可承受高温工况。实验结果显示，其峰值发射率可达0.8，工作频率可达20 MHz，比商用热膜快六个数量级。