https://doi.org/10.1051/epjconf/202328704020
Robust all-dielectric high Q-factor metasurface for sensing
1 School of Physics and AMBER, Trinity College Dublin, College Green, Dublin 2, Ireland
2 IPIC, Tyndall National Institute, Cork, T12 R5CP, Ireland
* Corresponding author: mccormoi@tcd.ie
Published online: 18 October 2023
All-dielectric metasurfaces have seen a recent surge of interest as an alternative to plasmonic devices, due to low losses and desirable optical properties. High Q-factor quasi-bound state in the continuum resonances can be manufactured and manipulated via designed asymmetry in the nanostructures. The presented metasurface design, based on a slotted disk nanostructure, produces strong E-Field enhancement with good surface coverage external to the structure. The design transition from structure-in-air to structure-on-substrate in a water-based sensing medium is presented, along with the robust tunability and multiplexing potential of our fabricated resonances. Our structure maintains a high Q-factor and refractive index sensitivity over a wide wavelength range in the visible and near-IR.
© The Authors, published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
