Broadband metamaterial as an “invisible” radiative cooling coat

Abstract In this paper, we propose a compact planar device in infrared ( 3 – 12 μ m ) that has a high emission range from 5 μ m to 8 μ m while simultaneously serving as a broadband mirror for the rest wavelengths by engineering its thermal emission characteristics. The structure utilizes a random-stacked multilayer to reduce the thickness required for ideal spectrum engineering. In addition, it is also convenient to fabricate and scale up. All the features above makes it an “invisible” radiative cooling coat by taking advantage of the atmospheric transparency window. We believe that this device may fundamentally enable new technological possibilities for stealth techniques by integrating the device with traditional cloaking methods.

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