Broadband achromatic transmission stealth cloak based on all dielectric metasurfaces

Abstract

The emergence of metasurface technology has brought innovation to the design of optical devices, and many optical devices based on metasurface have been proposed. However, the inherent dispersion of metasurface structures limits their ability to operate at wide frequencies. By changing the geometric parameters of the metasurface unit structure, the unit structure has achromatic properties on the basis of satisfying the phase gradient. Numerical simulation results demonstrate that the proposed multilayer transmissive metasurface stealth cloak has broadband stealth function in the frequency range of 0.7 to 0.77 THz. Achromatic broadband metasurface stealth devices provide new ideas for the design of broadband metasurface stealth devices, and also promote the research of other broadband metasurface optical devices.