Dual-band terahertz absorber based on square ring metamaterial structure

Area of Science:

• Physics
• Materials Science
• Electrical Engineering

Background:

• Terahertz (THz) technology requires efficient absorbers for various applications.
• Metamaterials offer unique electromagnetic properties for tailored device design.
• Developing dual-band absorbers is crucial for expanding THz applications.

Purpose of the Study:

• To design, fabricate, and measure a novel dual-band terahertz absorber.
• To investigate the absorption characteristics of a metamaterial structure.
• To provide a new design option for multi-band THz metamaterial absorbers.

Main Methods:

• Designing a metamaterial structure with a square metal ring and T-shaped strips on a silicon wafer with a ground plane.
• Fabricating the absorber prototype using electron beam lithography (EBL) and electron beam evaporation (EBE).
• Measuring the absorption performance using a terahertz time-domain spectroscopy (TDS) system.

Main Results:

• Achieved dual-band absorption peaks at 0.715 THz and 1.013 THz.
• Observed high Q-factors of 152.1 and 98.3 for the respective absorption peaks.
• Demonstrated good measurement results consistent with the design.

Conclusions:

• The proposed metamaterial structure effectively functions as a dual-band terahertz absorber.
• The fabrication and measurement confirm the viability of the designed absorber.
• This work presents a valuable new approach for developing multi-band terahertz metamaterial absorbers.