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Bandwidth improvement in copper-based terahertz metamaterial absorbers by structural engineering
Optics Express
|September 23, 2025
Summary
Two novel terahertz metamaterial absorbers were developed for advanced detectors and sensors. One offers narrowband high absorption and sensing, while the other provides broadband absorption exceeding 1.218 THz.
Area of Science:
- Physics
- Materials Science
- Electrical Engineering
Background:
- Terahertz (THz) absorbers are crucial components for THz detectors, imagers, and sensors.
- Metamaterials offer unique electromagnetic properties for designing efficient absorbers.
Purpose of the Study:
- To demonstrate two distinct terahertz metamaterial absorbers for narrowband and broadband applications.
- To optimize resonator geometry for tailored absorption bandwidths in THz systems.
Main Methods:
- Fabrication of metal/dielectric/metal three-layer architectures.
- Integration of periodic circular copper resonators and varied copper patches (circles, rings, split-rings).
- Utilizing TOPAS dielectric spacer and gold reflector.
Main Results:
- A narrowband absorber achieved 99.8% absorption at 8.344 THz with dual-band operation, polarization insensitivity, and high refractive index sensing sensitivity (1.626 THz/RIU).
- A broadband meta-absorber demonstrated high absorption over a bandwidth exceeding 1.218 THz (TE polarization).
- The broadband absorber outperformed existing copper-based meta-absorbers.
Conclusions:
- The developed metamaterial absorbers meet demands for both narrowband and broadband THz applications.
- The narrowband absorber shows significant potential for biosensing applications.
- The study provides a framework for designing THz absorbers with tunable bandwidths through resonator optimization.
