Enhancement of Faraday effect in one-dimensional magneto-optical photonic crystal including a magnetic layer with wavelength dependent off-diagonal elements of dielectric constant tensor

Chie Inui, Shinsuke Ozaki, Hiroaki Kura, Tetsuya Sato

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Optical and magneto-optical properties of one-dimensional magneto-optical photonic crystal (1-D MPC) prepared by the solgel dip-coating method, including a magnetic defect layer composed of mixture of CoFe2O4 and SiO2, are investigated from both the experimental and theoretical standpoints. The resonant transmission of light was observed around 570 nm in the photonic band gap. The Faraday rotation angle θF showed two maxima at 490 and 640 nm, and the wavelength dependence of θF above 760 nm was similar to that of the CoFe2O4SiO 2 single-layer film. The two maxima of θF are attributed to the enhanced Faraday rotation of nonmagnetic TiO2 layers in the cavity structure and that in magnetic CoFe2O 4SiO2 layer through the light localization in MPC. The maximum value of θF due to the magnetic CoFe2O 4SiO2 layer in the MPC was 22-times larger than that in the single-layer film. The simulation study of MPC with CoFe2O 4SiO2 magnetic defect layer, based on the matrix approach method, showed that the resonant light transmission was accompanied by the localization of electric field, and large enhancement of θF appeared at different wavelengths so as to agree with the experimental features. This can be explained in terms of the wavelength dependent off-diagonal components of the dielectric constant tensor in addition to the large extinction coefficient in the CoFe2O4SiO2 magnetic defect layer.

Original languageEnglish
Pages (from-to)2348-2354
Number of pages7
JournalJournal of Magnetism and Magnetic Materials
Volume323
Issue number18-19
DOIs
Publication statusPublished - 2011 Oct 1

Keywords

  • CoFe O
  • Dielectric constant tensor
  • Faraday effect
  • Magneto-optical photonic crystal
  • Matrix approach method
  • Solgel method

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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