Topological Band Engineering in q-BICs and EPs Derived from Visible Range Plasmons
Topological photonics, owing to its band topology, has substantial potential in applications such as quantum computation and photonic chips. However, attaining flexible control over band topology for effective light-matter interactions at the subwavelength scale remains elusive. In this study, we present a metal-insulator-metal (MIM) dimerized grating structure based on the one-dimensional (1D) Su-Schrieffer-Heeger model (SSH). This structure is designed for tuning optical band topology with a relatively high quality factor and small mode volume. Specifically, by variation of the grating thickness, topological band inversion with plasmonic quasi-bound states in the continuum (q-BICs) can be achieved. Moreover, through the modulation of gain-loss and coupling strength, the corresponding exceptional points (EPs) can emerge near the Brillouin zone center (Γ point). Consequently, this MIM dimerized grating structure offers a novel approach for the design of advanced topological devices.
Authors
- Cai Luo (ORCID: https://orcid.org/0009-0000-6540-9606)
- Guangzhou Geng (ORCID: https://orcid.org/0000-0003-3723-9632)
- Baoli Liu (ORCID: https://orcid.org/0000-0002-0828-5093)
- Yang Guo (ORCID: https://orcid.org/0000-0001-8975-9387)
- Qinghua Song (ORCID: https://orcid.org/0000-0002-4622-0418)
- Rongkun Zheng (ORCID: https://orcid.org/0000-0002-7860-2023)
- Changzhi Gu (ORCID: https://orcid.org/0000-0002-2689-2807)
- Shibing Tian
- Wei Li (ORCID: https://orcid.org/0009-0004-7704-8149)
- Haifang Yang
Institutions
- Chinese Academy of Sciences (CN)
- Yanshan University (CN)
- Physical Sciences (United States) (US)
- Tsinghua–Berkeley Shenzhen Institute (CN)
- FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ)
- Suzhou Research Institute (CN)
- Institute of Physics (CN)
- National Laboratory for Superconductivity (CN)
- University of Chinese Academy of Sciences (CN)
- Center for Excellence in Education (US)
- University of Hong Kong (HK)
- Tsinghua University (CN)
Publication Details
- Journal
- Nano Letters
- Published
- 2025-03-28
- DOI
- https://doi.org/10.1021/acs.nanolett.5c00144
- Citations
- 5
- Primary Topic
- Photonic and Optical Devices
- Type
- article
- Field-Weighted Citation Impact
- 3.65
Funders
- National Natural Science Foundation of China
- Chinese Academy of Sciences
- National Key Research and Development Program of China
- Basic and Applied Basic Research Foundation of Guangdong Province