Dynamically tunable multi-band quasi-permittivity-asymmetric BIC in the GST225 metasurface
Bound states in the continuum (BICs) on metasurfaces have garnered significant interest for their ultrahigh Q-factor potential in sensing applications. Reconfigurability and multi-band resonance are highly desirable for sensing systems. In this work, we introduce a metasurface comprising four nanocubes with different permittivity asymmetries, which can be dynamically adjusted using Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub> (GST225), a phase-change material, in the near-infrared (NIR) region. Additionally, a simulation for a liquid molecule sensor based on the metasurface shows a sensitivity of 1017 nm/RIU. This research introduces a novel, to the best of our knowledge, approach for designing multi-band, dynamically tunable quasi-BIC metasurfaces, which are good candidates for tunable, high-sensitivity biochemical sensing and nonlinear optics applications.
Authors
- Hua Ge (ORCID: https://orcid.org/0000-0003-1368-4301)
- Bo Jia (ORCID: https://orcid.org/0000-0002-0001-3851)
- Qiu Wang (ORCID: https://orcid.org/0000-0001-9778-5999)
- Xiang Li (ORCID: https://orcid.org/0000-0002-2977-3846)
- Han Zhuo Kuang
- Sheng Yi Wang
- Hao Luo (ORCID: https://orcid.org/0009-0005-0564-2883)
Institutions
- China University of Geosciences (CN)
Publication Details
- Journal
- Optics Letters
- Published
- 2024-08-05
- DOI
- https://doi.org/10.1364/ol.531446
- Citations
- 9
- Primary Topic
- Advanced Antenna and Metasurface Technologies
- Type
- article
- Field-Weighted Citation Impact
- 11.69
Funders
- National Natural Science Foundation of China
- Natural Science Foundation of Hubei Province