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Electrically tunable triple-narrowband terahertz filter using a graphene-embedded metasurface.
Applied Optics
|March 17, 2026
Summary
This study introduces an electrically tunable terahertz (THz) filter using graphene metasurfaces. The novel filter achieves precise control over three distinct THz bands for advanced communication and spectral analysis.
Area of Science:
- Metasurface technology
- Terahertz (THz) applications
- Graphene-based devices
Background:
- Terahertz filters are crucial for high-speed communications, spectral analysis, and imaging.
- Existing THz filters often lack tunability and multi-band capabilities.
Purpose of the Study:
- To propose and simulate an electrically tunable triple-narrowband transmissive THz filter.
- To demonstrate independent control over multiple THz frequency bands.
Main Methods:
- Design of a graphene-embedded metasurface with a triple resonator structure.
- Integration of a multi-channel gate voltage system to modulate graphene conductivity.
- Electromagnetic response simulation using THz wave propagation analysis.
Main Results:
- The filter exhibits three distinct transmission peaks at 0.52, 0.74, and 1.11 THz.
- Achieved a maximum transmittance modulation depth of 82.4%.
- Generated eight programmable transmission states via voltage control for independent band switching and amplitude adjustment.
Conclusions:
- The proposed graphene-embedded metasurface offers a novel solution for reconfigurable THz filtering.
- Enables independent switching and amplitude control of triple frequency bands.
- Provides advanced capabilities for multi-channel THz communication and spectral analysis.
