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Tunable BIC metamaterials with Dirac semimetals
Xiaoyong He1,2, Wenhan Cao3, Fangting Lin1,2
1Department of Physics, Mathematics & Science College, Shanghai Normal University, No. 100 Guilin Road, Shanghai, 200234, China.
Nanophotonics (Berlin, Germany)
|December 22, 2025
Summary
Bound states in the continuum (BIC) offer high Q-factors for metamaterials. Dirac semimetal (DSM) materials enhance BIC metamaterials for tunable devices in communications and detection.
Area of Science:
- Condensed Matter Physics and Materials Science
- Electromagnetism and Photonics
Background:
- Bound states in the continuum (BIC) offer ultrahigh Q-factors and confined modes, addressing dissipation in metamaterials (MMs) and plasmonic devices.
- Dirac semimetals (DSMs) provide high carrier mobility and tunable properties, enabling advanced functional device designs.
Purpose of the Study:
- To review recent advancements in BIC metamaterials utilizing Dirac semimetals (e.g., graphene, Cd3As2) and other novel materials (e.g., MoS2, borophene, GaSe).
- To explore the influence of Fermi levels, resonator types, and operating frequencies on BIC metamaterial performance.
- To discuss phenomena like tunable Fano resonance, epsilon-nearly-zero effects, and nonlinear harmonic generation.
Main Methods:
- Review of recent research on Dirac semimetal-based bound states in the continuum metamaterials.
- Analysis of factors influencing BIC metamaterial properties, including Fermi level, resonator design, and frequency range.
- Discussion of associated physical phenomena and their implications.
Main Results:
- Demonstration of tunable Fano resonance, strong epsilon-nearly-zero, and nonlinear harmonic effects in DSM-based BIC MMs.
- Identification of key parameters (Fermi levels, resonator types, frequency ranges) for optimizing BIC MM performance.
- Highlighting the potential of DSMs for high-performance functional devices.
Conclusions:
- Dirac semimetal-based BIC metamaterials offer promising solutions for high-performance functional devices.
- Understanding tunable mechanisms is crucial for developing applications in wireless communications, security detection, and astronomical observations.
- Future development trends point towards advanced filters, modulators, and polarizers.
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