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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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Topological Band Engineering in q-BICs and EPs Derived from Visible Range Plasmons.
Wei Li1,2, Cai Luo1,3, Shibing Tian1
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Nano Letters
|March 28, 2025
Summary
This study introduces a metal-insulator-metal grating structure for flexible control of topological photonics. It enables tunable band topology and light-matter interactions at the subwavelength scale for advanced photonic devices.
Area of Science:
- Topological photonics
- Condensed matter physics
- Nanophotonics
Background:
- Topological photonics offers potential for quantum computation and photonic chips.
- Controlling band topology for subwavelength light-matter interactions remains a challenge.
Purpose of the Study:
- To present a novel metal-insulator-metal (MIM) dimerized grating structure.
- To enable flexible control over optical band topology and light-matter interactions.
- To achieve high quality factors and small mode volumes in topological devices.
Main Methods:
- Utilizing the one-dimensional (1D) Su-Schrieffer-Heeger (SSH) model.
- Designing a MIM dimerized grating structure.
- Tuning topological band inversion via grating thickness variation.
- Modulating gain-loss and coupling strength to emerge exceptional points (EPs).
Main Results:
- Achieved topological band inversion with plasmonic quasi-bound states in the continuum (q-BICs).
- Demonstrated emergence of exceptional points (EPs) near the Brillouin zone center (Γ point).
- Showcased a structure with tunable band topology, high quality factor, and small mode volume.
Conclusions:
- The proposed MIM dimerized grating structure provides a new pathway for designing advanced topological devices.
- This work addresses the challenge of flexible control over band topology at the subwavelength scale.
- The findings pave the way for novel applications in topological photonics and integrated optics.
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