Ultra-High Normalized Bandwidth TE and TM Polarization Insensitive Terahertz Absorber with Graphene Disks Configuration

TL;DR

This paper presents a graphene-based terahertz absorber with ultra-broadband, polarization insensitivity, and high normalized bandwidth, achieved through a multilayer disk array design validated by FEM simulations.

Contribution

The design introduces a novel three-layer graphene disk array structure with impedance matching for ultra-broadband absorption in the terahertz range, surpassing previous graphene-based absorbers.

Findings

Normalized absorption bandwidth of 148%.

Achieved 2.64 THz bandwidth at 1.78 THz center frequency.

Device effectively absorbs both TE and TM polarizations.

Abstract

In this paper, we have proposed ultra-broadband terahertz absorber with three layers of periodic graphene disks arrays (PGDAs). A gold layer was utilized as backside reflector and TOPAS as dielectric spacers. Circuit model of PGDAs and the developed Transmission Line Model (TLM) for the absorber is utilized to design the structure using impedance matching concept. The validity of the results of the device was confirmed by Finite Element Method (FEM). The structure absorbs both TE and TM polarizations. Furthermore, the obtained normalized absorption bandwidth is 148% with a bandwidth of 2.64 THz in 1.78 THz central frequency which is to best of our knowledge the best report in two-dimensional graphene-based structures.