Ultrasensitive optical toroidal mode in all-dielectric nanosturctures

Ai-Yin Liu; Snow H. Tseng; Hui-Hsin Hsiao

doi:10.1117/12.2676576

4 October 2023 Ultrasensitive optical toroidal mode in all-dielectric nanosturctures

Ai-Yin Liu, Snow H. Tseng, Hui-Hsin Hsiao

Proceedings Volume PC12646, Metamaterials, Metadevices, and Metasystems 2023; PC126461D (2023) https://doi.org/10.1117/12.2676576
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States

Abstract

Toroidal moment, induced by currents flowing on the surface of a torus, plays an important role in the fundamental physics of light-matter interaction. However, natural toroidal response was usually overlooked due to weak interaction with other electromagnetic resonances. Recently, toroidal moments can be effectively excited in artificial metamaterial by utilizing complex nanostructures or special light sources. Here, we have proposed periodic amorphous silicon cylinders embedded in spin-on-glass layer that can successfully generate transverse toroidal dipole (TD) in optical regime under normal incident illumination. Both experimental and simulation results indicate that such TD mode sustains a large structural tolerance and can be spectrally tuned by stretching the cylindrical axis perpendicular to the light polarization. In addition, the excited TD mode also displays ultrahigh refractive index sensitivity. This approach provides a simple and straightforward way to implement TD metamaterials and serves a powerful platform for high-sensitivity biosensors and nonlinear optics.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Ai-Yin Liu, Snow H. Tseng, and Hui-Hsin Hsiao "Ultrasensitive optical toroidal mode in all-dielectric nanosturctures", Proc. SPIE PC12646, Metamaterials, Metadevices, and Metasystems 2023, PC126461D (4 October 2023); https://doi.org/10.1117/12.2676576

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