All-dielectric toroidal metasurfaces for sensing applications

Hui-Hsin Hsiao; Ai-Yin Liu

doi:10.1117/12.2676717

5 October 2023 All-dielectric toroidal metasurfaces for sensing applications

Hui-Hsin Hsiao, Ai-Yin Liu

Proceedings Volume PC12648, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XXI; PC1264811 (2023) https://doi.org/10.1117/12.2676717
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States

Abstract

We experimentally demonstrated an unprecedented simple way to excite strong and broadband toroidal dipole (TD) response in the optical regime using dielectric metasurfaces upon plane-wave excitation. A comprehensive study of the geometric dependence for the TD mode was performed. In addition, with the change of local refractive index surrounding dielectric nanopillars, the TD mode was found to reach a sensitivity of 459 nm per external refractive index (RIU) change, showing good correspondence to our numerical prediction of 470 nm/RIU. In addition, arrays of tilted angle of nanorod pairs were designed to sustain quasi-bound states in the continuum (quasi-BIC) with TD and electric quadrupole (EQ) resonant property, showing strongly optical fields at the surface of tilted nanobar pairs and resulting in a measured (simulated) sensitivity and figure of merit of 608 nm/RIU and 46 (612 nm/RIU and 85), respectively.

Conference Presentation

Citation Download Citation

Hui-Hsin Hsiao and Ai-Yin Liu "All-dielectric toroidal metasurfaces for sensing applications", Proc. SPIE PC12648, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XXI, PC1264811 (5 October 2023); https://doi.org/10.1117/12.2676717

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