Camouflage is a common technique in nature, enabling organisms to protect themselves from predators. The development of novel camouflage technologies, not only in fundamental science, but also in the fields of military and civilian applications, is of great significance. In this study, we propose a new type of deep-subwavelength four-layered meta-coating consisting of Si, Bi, Si, and Cr from top to bottom with total thickness of only ∼355 nm for visible-infrared compatible camouflage. The visible color and the infrared emission properties of the meta-coating can be independently adjusted. Colorful meta-coating for visible camouflage can be obtained by changing the thickness of top Si layer, while the selective high emissivity in non-atmospheric window for infrared camouflage remains. Due to the deep-subwavelength properties, the meta-coating shows high angle tolerance in both visible and infrared regions. The compatible camouflage capability of our proposed meta-coating in the visible-infrared region is validated under different environments. The deep-subwavelength, angular insensitivity, visible-infrared compatibility and large-area fabrication feasibility promise the meta-coating an effective solution for camouflage in various applications such as military weapons and anti-counterfeiting.

中文翻译：

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用于可见光-红外兼容伪装的深亚波长多层元涂层

伪装是自然界中的一种常见技术，使生物体能够保护自己免受捕食者的侵害。新型伪装技术的发展不仅在基础科学领域，而且在军事和民用应用领域都具有重要意义。在这项研究中，我们提出了一种新型的深亚波长四层超涂层，从上到下由 Si、Bi、Si 和 Cr 组成，总厚度仅为 ∼355 nm，用于可见光-红外兼容伪装。元涂层的可见光颜色和红外发射特性可以独立调节。通过改变顶层硅层的厚度，可以获得用于可见光伪装的彩色元涂层，同时保留了用于红外伪装的非大气窗口中的选择性高发射率。由于深亚波长特性，元涂层在可见光和红外区域均表现出高角度容差。我们提出的元涂层在可见红外区域的兼容伪装能力在不同环境下得到了验证。深亚波长、角度不敏感、可见红外兼容性和大面积制造可行性使得元涂层成为军事武器和防伪等各种应用中伪装的有效解决方案。