Infrared Absorber Leveling in Ultra-Wideband by Using Hybrid Plasmonic Structure

Abstract

In this paper, an effective ultra-broadband absorber in long-wavelength infrared is achieved by a metal-insulator-metasurface (MIM) stacked structure. This absorber exhibits an average absorption of 90% at wavelengths ranging from 8 to 14 µm and a maximum absorption rate of up to 97.1%. It is found that the performance is achieved by three mode combinations. The ultra-broadband leveling absorber is to be polarization-independent due to its geometrical symmetry. The absorption property can be controlled by the parameters of the triangle unit. It has great potential in many applications such as infrared detection and imaging.