Bridging the Fabry–Perot cavity and asymmetric Berreman mode for long-wave infrared nonreciprocal thermal emitters

IF 4.4 2区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY
ZiHe Chen, ShiLv Yu, Run Hu
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引用次数: 0

Abstract

The long-wave infrared band (8–14 µm) is essential for several applications, such as infrared detection, radiative cooling, and near-field heat transfer. However, according to Kirchhoff’s law, the intrinsic balance between thermal absorption and emission limits the further improvement of photon energy conversion and thermal management. Thus, breaking Kirchhoff’s balance and achieving nonreciprocal thermal radiation in the long-wave infrared band are necessary. Most existing designs for nonreciprocal thermal emitters rely on grating or photonic crystal structures to achieve nonreciprocal thermal radiation at narrow peaks, which are relatively complex and typically realize bands larger than 14 µm. Here, a sandwich structure consisting of an epsilon-near-zero (ENZ) magneto-optical layer (MOL), a dielectric layer (DL), and a metal layer is proposed to achieve a strong nonreciprocal effect in the long-wave infrared band, which is mainly attributed to the strengthening of the asymmetric Berreman mode by the Fabry–Perot cavity. In addition, the impact of the incident angle, DL thickness, and DL refractive index on the nonreciprocal thermal radiation has been investigated. Moreover, by replacing the ENZ MOL with the gradient ENZ MOL, the existence of the DL can further improve the nonreciprocity of the broadband nonreciprocal thermal radiation. The proposed work promotes the development and application of nonreciprocal energy devices.

为长波红外非互易热发射器搭建法布里-珀罗腔和非对称贝里曼模式的桥梁
长波红外波段(8-14 微米)对于红外探测、辐射冷却和近场传热等多种应用都至关重要。然而,根据基尔霍夫定律,热吸收和热发射之间的内在平衡限制了光子能量转换和热管理的进一步改进。因此,必须打破基尔霍夫定律的平衡,实现长波红外波段的非互惠热辐射。现有的非互易热辐射器设计大多依靠光栅或光子晶体结构来实现窄峰值的非互易热辐射,这些结构相对复杂,通常实现的波段大于 14 µm。本文提出了一种由ε-近零(ENZ)磁光层(MOL)、介质层(DL)和金属层组成的三明治结构,在长波红外波段实现了强烈的非互易效应,这主要归功于法布里-珀罗腔对不对称贝里曼模式的强化。此外,还研究了入射角、DL 厚度和 DL 折射率对非对等热辐射的影响。此外,通过用梯度 ENZ MOL 取代 ENZ MOL,DL 的存在可以进一步改善宽带非互易热辐射的非互易性。该研究成果促进了非互惠能源设备的开发和应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Science China Technological Sciences
Science China Technological Sciences ENGINEERING, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
8.40
自引率
10.90%
发文量
4380
审稿时长
3.3 months
期刊介绍: Science China Technological Sciences, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research. Science China Technological Sciences is published in both print and electronic forms. It is indexed by Science Citation Index. Categories of articles: Reviews summarize representative results and achievements in a particular topic or an area, comment on the current state of research, and advise on the research directions. The author’s own opinion and related discussion is requested. Research papers report on important original results in all areas of technological sciences. Brief reports present short reports in a timely manner of the latest important results.
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