Magnetic Control of Optical Reflectance from Metallic Thin Film Using Surface Plasmon Resonance and Faraday Rotation
- Authors
- Son, Changjin; Ju, Heongkyu
- Issue Date
- Jun-2021
- Publisher
- MDPI
- Keywords
- noble metal film; surface plasmon resonance; Faraday rotation; magnetic modulation; magnetic anisotropy; optical reflectance
- Citation
- MATERIALS, v.14, no.12
- Journal Title
- MATERIALS
- Volume
- 14
- Number
- 12
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/81576
- DOI
- 10.3390/ma14123354
- ISSN
- 1996-1944
- Abstract
- We demonstrate magnetic control of optical reflectance with no ferromagnetic material via combining the Faraday rotation and the surface plasmon resonance (SPR) in a Kretschman configuration under magnetic fields < 0.5 T. The SPR produces the polarization sensitive reflectance from the Au or Ag thin film coated on a N-BK7 prism in which the Faraday rotation occurs. The gold (Au) or silver (Ag) metal film as a plasmonic film somewhat acts as an incident angle-dependent reflection polarizer that can sensitively sense the polarization change induced by the Faraday rotation that occurs in a prism. We find that combination of Faraday rotation and the surface plasmon can induce a significant magnetic modulation of reflectance normalized with respect to that obtained with no magnetic fields at a specific incident angle of light. The magnetic control of optical reflectance presented may find an application in polarizer-free photonic devices with no ferromagnetic material for magneto-optical modulation.
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