LAUSR

Metasurfaces based on metal-dielectric-metal structures have been an effective means to comprehensively suppress infrared radiation. In this paper, we propose the idea of discretization to divide the circular resonator into countless rectangular elements and establish a complex equivalent LC circuit model, which provides a rapid design method for broadband absorption metasurfaces. The metasurface composed of two circle-shaped metal-dielectric-metal resonators were preliminarily designed based on impedance matching, and the geometric parameters and materials were optimally decided through numerical simulation. To validate the simulated result, we experimentally prepared a sample of the designed metasurface, the measured spectrum has revealed the radiative cooling ability (60% absorption over a range of 5–8 μm) and achieved infrared stealth (nearly 90% reflectance in the two atmospheric windows). Furthermore, the method provides potential applications to other requirements of thermal radiation regulation and theoretical support for establishing the model of metasurfaces with other configurations.