Ultra-broadband dual-square ring metamaterial absorbers from visible to far-infrared region

Abstract

This study proposes an ultra-wideband (UWB) metamaterial absorber based on dual-square ring (DSR) microstructures from the visible to the far-infrared region. The simulation results indicated that the absorber achieved more than 90% absorption in the wavelength range of 1200 nm to 11,000 nm. In addition, the absorption rate is greater than 80% in the wavelength range of 500–13,000 nm, achieving an ultra-broadband absorption with a bandwidth of over 12,000 nm. The designed UWB absorber has promising applications in thermal photovoltaic power generation, infrared imaging, photoelectric detection.