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Updated: Dec 1, 2025
Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
Published on: November 21, 2019
Optical detection for magnetic field using Ni-subwavelength grating on SiO2/thin-film Ag/glass structure
Yuusuke Takashima1, Kohei Moriiwa2, Masanobu Haraguchi3,4
1Graduate School of Science and Technology, Tokushima University, 2-1 Minami-josanjima, Tokushima, 7708506, Japan. takashima@tokushima-u.ac.jp.
Abstract:
An optical sensor for magnetic field detection using Ni-subwavelength grating (SWG) on SiO2/Ag-thin-film/glass substrates was experimentally developed on the basis of the re-radiation condition of surface-plasmon-polaritons (SPPs) at Ag surfaces. The fabricated sample showed two dips in the reflection spectra associated with SPP excitation, and the optical response exhibited good agreement with that simulated by the finite-difference time-domain method. The reflectivity at one of the dip wavelengths varied minimally with the application of the magnetic field, whereas that at the other dip wavelength significantly decreased owing to the large electric field overlap of SPP with the magnetized Ni-SWG. As a result, a magnetic field on the order of a few mT could be detected with a simple normal-incidence optical system.
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