Document Type
Journal Article
Publication Title
Sensors
Volume
21
Issue
6
First Page
1
Last Page
10
Publisher
MDPI
School
Electron Science Research Institute / School of Science
RAS ID
36197
Funders
Russian Science Foundation
Abstract
We propose an all-dielectric magneto-photonic crystal with a hybrid magneto-optical response that allows for the simultaneous measurements of the surface and bulk refractive index of the analyzed substance. The approach is based on two different spectral features of the magneto-optical response corresponding to the resonances in p-and s-polarizations of the incident light. Angular spectra of p-polarized light have a step-like behavior near the total internal reflection angle which position is sensitive to the bulk refractive index. S-polarized light excites the TE-polarized optical Tamm surface mode localized in a submicron region near the photonic crystal surface and is sensitive to the refractive index of the near-surface analyte. We propose to measure a hybrid magneto-optical intensity modulation of p-polarized light obtained by switching the magnetic field between the transverse and polar configurations. The transversal component of the external magnetic field is responsible for the magneto-optical resonance near total internal reflection conditions, and the polar component reveals the resonance of the Tamm surface mode. Therefore, both surface-and bulk-associated features are present in the magneto-optical spectra of the p-polarized light.
DOI
10.3390/s21061984
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Comments
Ignatyeva, D., Kapralov, P., Golovko, P., Shilina, P., Khramova, A., Sekatskii, S., ... Belotelov, V. (2021). Sensing of surface and bulk refractive index using magnetophotonic crystal with hybrid magneto-optical response. Sensors, 21(6), article 1984. https://doi.org/10.3390/s21061984