Terahertz dual-resonance bandpass filter using bilayer reformative complementary metamaterial structures

Area of Science:

• Physics
• Electrical Engineering
• Materials Science

Background:

• Metamaterials offer unique electromagnetic properties for advanced filter designs.
• Terahertz (THz) frequency range requires specialized filters for applications like spectroscopy and imaging.
• Frequency selective surfaces (FSS) are crucial components in THz systems.

Purpose of the Study:

• To propose and validate a dual-resonance frequency selective surface (FSS) filter in the terahertz (THz) range.
• To investigate the use of bilayer modified complementary metamaterial structures for THz filtering.
• To address manufacturing challenges associated with thin quartz substrates in THz devices.

Main Methods:

• Design and simulation of a dual-band FSS filter using complementary metamaterial structures.
• Fabrication of the proposed filter on a single crystal quartz substrate.
• Experimental characterization using THz time-domain spectroscopy (THz-TDS).

Main Results:

• The designed filter exhibits dual-bandpass characteristics centered at 0.315 THz and 0.48 THz.
• Experimental measurements show excellent agreement with simulation results across the 0.1 to 0.6 THz range.
• Optimized design demonstrates good transmission response with realizable substrate thicknesses, mitigating manufacturing risks.

Conclusions:

• The proposed bilayer modified complementary metamaterial structure effectively creates a dual-resonance THz FSS filter.
• The study validates the feasibility of fabricating such filters on quartz substrates with practical thicknesses.
• The results confirm the potential of this metamaterial-based filter for THz applications.