Angle-insensitive multilayer metacoating with dual-band selective emission for infrared camouflage and radiative cooling

IF 7.4

Materials Today Electronics Pub Date : 2025-09-22 DOI:10.1016/j.mtelec.2025.100177

Liyan Li , Dongjie Zhou , Jinguo Zhang , Lei Zhou , Junhao Chu , Qiong He , Jiaming Hao

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引用次数: 0

Abstract

The mid-infrared (MIR) spectral region, covering the atmospheric transmission windows (ATWs) of 3–5 μm (mid-wavelength infrared, MWIR) and 8–13 μm (long-wavelength infrared, LWIR), is critical for applications such as infrared camouflage and radiative cooling due to its low atmospheric absorption. Here, we present a high-efficiency, deep-subwavelength multilayer metacoating (MMC) designed for dual-band emission in the MWIR and LWIR ATWs. Through selective impedance matching, the quad-layer MMC achieves average emissivities of 0.79 in the MWIR and 0.83 in the LWIR ATWs, while suppressing emissivity to 0.33 in the non-ATW range of 5–8 μm. Experimental results confirm these findings, which arise from electromagnetic localization within the multilayer architecture and dissipation in lossy materials (Ti and Cr). Notably, the emitter exhibits angle-insensitive performance, maintaining emissivities of 0.65 (MWIR) and 0.72 (LWIR) at incidence angles up to 70°, and demonstrates effective LWIR camouflage against high-emissivity backgrounds. Theoretical analysis further reveals its potential for nighttime radiative cooling. This work advances scalable, low-cost metacoatings for dual-functional infrared technologies, addressing key challenges in military signature management, thermal regulation, and energy-efficient aerospace systems.

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用于红外伪装和辐射冷却的双波段选择性发射的角度不敏感多层稳镀膜

中红外（MIR）光谱区域覆盖3-5 μm（中波长红外，MWIR）和8-13 μm（长波长红外，LWIR）的大气透射窗口（atw），由于其低大气吸收，在红外伪装和辐射冷却等应用中至关重要。在这里，我们提出了一种高效，深亚波长多层稳镀膜（MMC），设计用于MWIR和LWIR ATWs的双频发射。通过选择性阻抗匹配，四层MMC在MWIR波段的平均发射率为0.79，在LWIR波段的平均发射率为0.83，而在5-8 μm的非atw波段的平均发射率为0.33。实验结果证实了这些发现，这些发现是由多层结构内的电磁局域化和损耗材料（Ti和Cr）的耗散引起的。值得注意的是，发射器具有角度不敏感性能，在入射角高达70°时保持0.65 （MWIR）和0.72 （LWIR）的发射率，并且在高发射率背景下表现出有效的LWIR伪装。理论分析进一步揭示了其夜间辐射冷却的潜力。这项工作推进了双功能红外技术的可扩展、低成本元涂层，解决了军事特征管理、热调节和节能航空航天系统中的关键挑战。

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

Materials Today Electronics

CiteScore

2.10

自引率

0.00%

发文量