Planar Epsilon-Near-Zero Cavity for Nonreciprocity of Thermal Radiation Enhancement

IF 2.3 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Photonics Technology Letters Pub Date : 2024-08-12 DOI:10.1109/LPT.2024.3442251

Liming Qian;Jingfei Ye;Shixin Pei;Gaige Zheng

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引用次数: 0

Abstract

Stacked epsilon-near-zero (ENZ)/insulator/ENZ nanocavity has recently emerged as a promising platform to study and engineer mid-infrared (MIR) absorption and emission, as they can be realized by lithography-free fabrication process with fine control on the optical and geometrical parameters. Using Weyl semimetal (WSM) thin film as nonreciprocal materials, we study the absorption, emission and nonreciprocity enhancement induced by a specifically tailored ENZ/WSM/ENZ structure. The nonreciprocity equals to 0.987 with a resonant wavelength of

$9~\mu m$

, which confirms an obvious violation of Kirchhoff’s law. We also discuss the possibility of tailoring the magnitude and sign of nonreciprocity within the MIR spectrum simply by finely designing the thickness of each layer in the stack. The presented unpatterned configuration and broad tunability of high-quality resonance can work for a wide range of incidence angles, making such proposal with great potential for thermal scavenging and conversion.

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平面ε-近零空腔实现热辐射增强的非对等性

堆叠ε-近零（ENZ）/绝缘体/ENZ纳米腔最近已成为研究和设计中红外（MIR）吸收和发射的一个前景广阔的平台，因为它们可以通过无光刻制造工艺实现，并可对光学和几何参数进行精细控制。我们使用韦尔半金属（WSM）薄膜作为非互易材料，研究了专门定制的ENZ/WSM/ENZ结构引起的吸收、发射和非互易性增强。共振波长为 $9~\mu m$时，非互惠性等于 0.987，这证实了对基尔霍夫定律的明显违反。我们还讨论了通过精细设计堆栈中每一层的厚度，在中红外光谱范围内定制非互易性大小和符号的可能性。所提出的无图案配置和高质量共振的广泛可调性可适用于广泛的入射角度，使这种建议在热清除和转换方面具有巨大的潜力。

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

IEEE Photonics Technology Letters 工程技术-工程：电子与电气

CiteScore

5.00

自引率

3.80%

发文量

404

审稿时长

2.0 months

期刊介绍： IEEE Photonics Technology Letters addresses all aspects of the IEEE Photonics Society Constitutional Field of Interest with emphasis on photonic/lightwave components and applications, laser physics and systems and laser/electro-optics technology. Examples of subject areas for the above areas of concentration are integrated optic and optoelectronic devices, high-power laser arrays (e.g. diode, CO2), free electron lasers, solid, state lasers, laser materials'' interactions and femtosecond laser techniques. The letters journal publishes engineering, applied physics and physics oriented papers. Emphasis is on rapid publication of timely manuscripts. A goal is to provide a focal point of quality engineering-oriented papers in the electro-optics field not found in other rapid-publication journals.