A terahertz polarization insensitive dual band metamaterial absorber

TLDR

Metamaterial absorbers have attracted considerable attention for applications in the terahertz range. The study reports the design, fabrication, and characterization of a terahertz dual‑band metamaterial absorber exhibiting two high‑absorption peaks. High absorption is achieved by tailoring the periodic patterned structures and dielectric layer thickness of a metal–dielectric–metal stack, designed via finite‑difference time‑domain simulations and verified with Fourier‑transform infrared spectroscopy. Experimentally, the absorber shows distinct peaks at 2.7 and 5.2 THz with absorption values of 0.68 and 0.74, matching the simulations.

Abstract

Metamaterial absorbers have attracted considerable attention for applications in the terahertz range. In this Letter, we report the design, fabrication, and characterization of a terahertz dual band metamaterial absorber that shows two distinct absorption peaks with high absorption. By manipulating the periodic patterned structures as well as the dielectric layer thickness of the metal–dielectric–metal structure, significantly high absorption can be obtained at specific resonance frequencies. Finite-difference time-domain modeling is used to design the structure of the absorber. The fabricated devices have been characterized using a Fourier transform IR spectrometer. The experimental results show two distinct absorption peaks at 2.7 and 5.2 THz, which are in good agreement with the simulation. The absorption magnitudes at 2.7 and 5.2 THz are 0.68 and 0.74, respectively.