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3D Dirac semimetals supported tunable terahertz BIC metamaterials
Xiaoyong He1,2, Fangting Lin1,2, Feng Liu1,2
1Department of Physics, Mathematics & Science College, Shanghai Normal University, No. 100 Guilin Road, Shanghai, 200234, China.
Nanophotonics (Berlin, Germany)
|December 5, 2024
Summary
This study explores tunable terahertz (THz) devices using 3D Dirac semimetals (DSM). Researchers achieved significant amplitude and frequency modulation in quasi-bound in continuum (BIC) resonance by adjusting DSM Fermi levels and resonator configurations.
Area of Science:
- Condensed Matter Physics
- Nanophotonics
- Terahertz (THz) Technology
Background:
- 3D Dirac semimetals (DSM) exhibit unique electronic properties.
- Quasi-bound in continuum (BIC) resonances offer high-Q factors for electromagnetic field confinement.
- Tunable THz devices are crucial for advanced applications.
Purpose of the Study:
- Investigate tunable propagation properties of BIC resonance in THz regime using DSM-supported resonators.
- Analyze the influence of rotation angles, DSM Fermi level, and resonator configuration on BIC resonance.
- Explore potential applications in novel tunable THz devices.
Main Methods:
- Utilized 3D Dirac semimetals (DSM) in tilted double elliptical resonators.
- Investigated terahertz (THz) wave propagation properties.
- Analyzed effects of varying rotation angles, DSM Fermi level, and resonator geometry.
- Simulated and analyzed transmission dips, Q-factors, amplitude, and frequency modulation.
Main Results:
- Achieved sharp BIC transmission dips with Q-factors exceeding 60 by altering resonator rotation angles.
- Observed significant BIC resonance modulation (92.75% amplitude, 44.99% frequency) with DSM Fermi level changes (0.01-0.15 eV).
- Excited additional red-shifted transmission dips by modifying resonator configuration, such as inserting dielectric holes.
Conclusions:
- Demonstrated effective tunability of BIC resonance in THz regime using DSM plasmonic structures.
- Highlighted the significant impact of DSM Fermi level and resonator design on resonance properties.
- Paved the way for developing novel tunable THz modulators, filters, and sensors.
