Strong Nonreciprocal Broadband Thermal Radiation via Materials Informatics Inverse Design

IF 7.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Zihe Chen, Run Hu
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Abstract

Through magneto-optical materials or spatiotemporal metamaterials, the reciprocity relation between thermal emission and absorption can be broken, achieving the more flexible nonreciprocal thermal radiation (NTR) to even approach the ultimate thermodynamic limit, such as the Landsberg limit. However, most NTR emitters only cover a narrow band, which is unwanted for thermal energy utilization. Here, a material-informatics framework with a Bayesian optimization (BO) kernel is proposed for designing NTR emitters, which consists of multilayer epsilon-near-zero (ENZ) magneto-optical films on a metal bottom. The optimal structural parameters can be obtained within only 0.5% of all possible structures, demonstrating super-efficient optimization capability. Additionally, compared to the design method based on the Fresnel formula, the broadband nonreciprocity can be significantly enhanced, with the wavelength-averaged nonreciprocity improved by 80.4%, which can be attributed to the unequal electromagnetic power dissipation density and mismatched effective impedance at opposite angles. Furthermore, the effects of the dielectric layer, different incident angles, number of layers, and magnetic fields on BO-based nonreciprocal thermal emitters have been investigated. This study can further promote the development of broadband NTR and can be extended to multilayer structures containing magnetic Weyl semimetals.

Abstract Image

基于材料信息学逆设计的强非互易宽带热辐射
通过磁光材料或时空超材料,可以打破热发射和吸收之间的互易关系,实现更灵活的非互易热辐射(NTR),甚至接近终极热力学极限,如Landsberg极限。然而,大多数NTR发射器只覆盖一个窄带,这是不希望热能利用。本文提出了一种具有贝叶斯优化核的材料信息学框架,用于设计在金属底部由多层epsilon-near-zero (ENZ)磁光薄膜组成的NTR发射器。在所有可能结构的0.5%范围内即可获得最优结构参数,显示出超高效的优化能力。此外,与基于菲涅耳公式的设计方法相比,宽带非互易性得到了显著增强,波长平均非互易性提高了80.4%,这主要归因于电磁功率耗散密度不均匀和相反角度有效阻抗不匹配。此外,还研究了介质层、不同入射角、层数和磁场对bo基非互易热辐射体的影响。该研究可以进一步促进宽带NTR的发展,并可扩展到含磁性Weyl半金属的多层结构。
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来源期刊
Advanced Optical Materials
Advanced Optical Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-OPTICS
CiteScore
13.70
自引率
6.70%
发文量
883
审稿时长
1.5 months
期刊介绍: Advanced Optical Materials, part of the esteemed Advanced portfolio, is a unique materials science journal concentrating on all facets of light-matter interactions. For over a decade, it has been the preferred optical materials journal for significant discoveries in photonics, plasmonics, metamaterials, and more. The Advanced portfolio from Wiley is a collection of globally respected, high-impact journals that disseminate the best science from established and emerging researchers, aiding them in fulfilling their mission and amplifying the reach of their scientific discoveries.
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