Dual-band terahertz absorber based on square ring metamaterial structure

Abstract

In this paper, a dual-band terahertz absorber based on metamaterial structure is designed, fabricated, and measured. The metal periodic array is located on the upper surface of a silicon wafer with a metal ground plane, while the metamaterial structure is created utilizing a square metal ring with four T-shaped metal strips loaded inside of the ring. Two absorption peaks are realized at 0.715 and 1.013 THz with high Q-factors of 152.1 and 98.3, respectively, under normal TE and TM polarized incidence. A prototype of the proposed metamaterial absorber is fabricated by electron beam lithography (EBL) and electron beam evaporation (EBE) technology. Furthermore, a terahertz time-domain spectroscopy (TDS) measurement system is employed to test the absorber sample, with good measurement results obtained. This work provides a new option for the design of multi-band terahertz metamaterial absorbers.

Multi-band absorber based on metal-silicon metasurface for sensing application

“…The sensitivity of the absorption peak at 3.62THz and 3.81THz is 3 THz/RIU and 3.59 THz/RIU respectively. In the same year, Wang et al [8] designed a twoband terahertz absorber based on a metamaterial structure. The metal periodic array of the structure is located on the upper surface of a silicon wafer with a metal base plane, and the top layer adds four T-shaped metal strips inside the metal square ring.…”

Independent dual-band absorptions with large frequency ratio and large bandwidth ratio from composite metamaterials of water pyramids over Helmholtz resonators

“…11.64 GHz-14.55 GHz [4]. Wang et al demonstrated a similar double square ring structure with high Q perfect absorption at 0.715 THz and 1.013 THz, respectively, on the basis of the different intrinsic resonant frequencies of different sized rings [5]. Zhang et al proposed a graphene based metamaterial absorber to trap dual broadband waves in the frequency range of 0.79-20.9 GHz and 25.1-40 GHz [6].…”