A paper co-authored by Professor Yuki Kimura of Hokkaido University’s Institute of Low Temperature Science has been published in The Journal of Physical Chemistry C.
- Hiromasa Niinomi, Hiroki Nada, Tetsuya Hama, Kazuhiro Gotoh, Yumiko Kodama, Tomoya Oshikiri, Masaru Nakagawa, Yuki Kimura. Mie Voids for High-Pressure Refractive Index Sensing. The Journal of Physical Chemistry C, J. Phys. Chem. C (2025) 129 (46): 20676–20683.
DOI: https://doi.org/10.1021/acs.jpcc.5c05941
Abstract
A simpler and more sensitive method for the measurement of the refractive index (RI) of materials under high pressure is desirable for the advancement of materials science. Nanophotonic RI sensing based on the localized surface plasmon resonance (LSPR) of gold nanorods dispersed in an anvil cell could achieve simplicity and high sensitivity. However, this method is restricted by deformations of the nanorods resulting from nonhydrostatic effects and so on. Here, we have developed a dielectric Mie-void resonator array for local RI sensing at high pressures by fabricating a submicron hole array on an anvil of stiff 4H-silicon carbide. The spectral shift of the Mie voids allowed us to detect pressure-induced changes in the RI of water with the sensitivity of approximately 290 ± 110 nm per RI unit, which is comparable with that based on LSPR. Our method has the advantages of robustness against deformation and a fine spatial resolution.
© 2025 The Authors. Published by American Chemical Society. This publication is licensed under a Creative Commons Attribution 4.0 International License. J. Phys. Chem. C (2025) 129 (46): 20676–20683. https://doi.org/10.1021/acs.jpcc.5c05941