Journal
NATURE COMMUNICATIONS
Volume 12, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41467-021-22051-0
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Funding
- National Key Research and Development Program of China [2017YFA0205700, 2017YFE0100200]
- National Natural Science Foundation of China [61975181, 61775194, 61950410608]
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This paper demonstrates a camouflage method that covers a wide range of frequencies based on multilayer and metasurface technologies, achieving multispectral camouflage and efficient radiative cooling simultaneously.
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 mu m), lasers (1.55 and 10.6 mu m) and microwave (8-12GHz) bands with simultaneous efficient radiative cooling in the non-atmospheric window (5-8 mu m). 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 degrees C reduction of inner/surface temperature, and 53.4/13.0% IR signal decrease in mid/long wavelength IR bands, at 2500W.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 136W.m(-2) to 252W.m(-2) at 150 degrees C surface temperature. This work may introduce the opportunities for multispectral manipulation, infrared signal processing, thermal management, and energy-efficient applications. Manipulating electromagnetic waves to camouflage objects is an important tool. Here, the authors present a camouflage that covers a wide range of frequencies based on multilayer and metasurface technologies.
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