髙島, 祐介 Tokushima University 徳島大学 教育研究者総覧
Moriiwa, Kohei Tokushima University
原口, 雅宣 Tokushima University 徳島大学 教育研究者総覧 KAKEN研究者をさがす
直井, 美貴 Tokushima University 徳島大学 教育研究者総覧 KAKEN研究者をさがす
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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