Dual-band terahertz absorber based on square ring metamaterial structure

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.(c) 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Automated summary

In this paper, a dual-band terahertz absorber based on a metamaterial structure is designed, fabricated, and measured. The absorber achieves two absorption peaks at 0.715 and 1.013 THz with high Q-factors of 152.1 and 98.3, respectively, under TE and TM polarized incidence. The prototype of the metamaterial absorber is fabricated using electron beam lithography and electron beam evaporation technology, and its performance is tested using terahertz time-domain spectroscopy. This work offers a new option for designing multi-band terahertz metamaterial absorbers.