Investigation and Analysis of Absorption in One-Dimensional Dielectric-Metal Photonic Crystal Absorbers

Abstract

This paper investigates the spectral response of a one-dimensional dielectric-metal photonic crystal absorber. The reflection and absorption spectra are obtained by applying the transfer matrix method (TMM) in the frequency range of 0.1 THz to 10 THz. The effects of influencing factors like the incident angle, thickness and material of the metal and dielectric layers on the absorption spectrum of the absorber are explored. Finally, a high-efficient absorber with a comprehensive free spectral range (FSR) of 1.46 THz and fitness of 2.496 is proposed. The numerical calculations show that high absorption of 99.37% and a high reflection of 3.23% are achievable for the absorber. Therefore, the absorber can be used as a perfect absorber and a perfect reflector over a wide range of frequencies.