Abstract
In our study, a new Metal-Insulator-Metal-Insulator (MIMI) metamaterial design was made to achieve selective infrared absorption consisting of layers arranged in the form of a metal-insulator (Ag-ITO) O-Ring shaped on a planar metal-insulator (Ag-Si) metasurface. The proposed metamaterial design has been studied for the spectral region between infrared wavelengths 800 and 12000 nm. Spectral features were analyzed using finite difference time domain (FDTD) software. This design maintains low emission in atmospheric windows in the mid-wave infrared (MWIR) and long-wave infrared (LWIR) range. However, the MIMI structure obtained two broadband absorption peaks in the shortwave infrared (SWIR) and non-conducted infrared (NTIR) regions, which perfectly match the thermal camouflage and radiative cooling windows. Moreover, the proposed structure is polarization insensitive as it has an in-plane symmetrical design. The optical performance of the structure was optimized using numerical simulation techniques. The impedance values of the nanostructure and air were compared. It was shown that they provide excellent compatibility and that the average absorption values are very close to the desired value in the MWIR and LWIR regions. The designed structure offers an adjustable and highly efficient solution to manage thermal emissions in various applications and is an important innovation in the field of privacy technology.