Multispectral camouflage for infrared, visible, lasers and microwave with radiative cooling

Huanzheng Zhu, Qiang Li (), Chenning Tao, Yu Hong, Ziquan Xu, Weidong Shen, Sandeep Kaur, Pintu Ghosh and Min Qiu ()
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Huanzheng Zhu: Zhejiang University
Qiang Li: Zhejiang University
Chenning Tao: Zhejiang University
Yu Hong: Zhejiang University
Ziquan Xu: Zhejiang University
Weidong Shen: Zhejiang University
Pintu Ghosh: Zhejiang University
Min Qiu: Westlake University

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Interminable surveillance and reconnaissance through various sophisticated multispectral detectors present threats to military equipment and manpower. However, a combination of detectors operating in different wavelength bands (from hundreds of nanometers to centimeters) and based on different principles raises challenges to the conventional single-band camouflage devices. In this paper, multispectral camouflage is demonstrated for the visible, mid-infrared (MIR, 3–5 and 8–14 μm), lasers (1.55 and 10.6 μm) and microwave (8–12 GHz) bands with simultaneous efficient radiative cooling in the non-atmospheric window (5–8 μm). The device for multispectral camouflage consists of a ZnS/Ge multilayer for wavelength selective emission and a Cu-ITO-Cu metasurface for microwave absorption. In comparison with conventional broadband low emittance material (Cr), the IR camouflage performance of this device manifests 8.4/5.9 °C reduction of inner/surface temperature, and 53.4/13.0% IR signal decrease in mid/long wavelength IR bands, at 2500 W ∙ m−2 input power density. Furthermore, we reveal that the natural convection in the atmosphere can be enhanced by radiation in the non-atmospheric window, which increases the total cooling power from 136 W ∙ m−2 to 252 W ∙ m−2 at 150 °C surface temperature. This work may introduce the opportunities for multispectral manipulation, infrared signal processing, thermal management, and energy-efficient applications.

Date: 2021
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DOI: 10.1038/s41467-021-22051-0

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