Preparation of one-dimensional photonic crystals by sol-gel process for magneto-optical materials

Chie Inui, Yosuke Tsuge, Hiroaki Kura, Shinobu Fujihara, Seimei Shiratori, Tetsuya Sato

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

One-dimensional photonic crystal (PC) of periodically alternating low (SiO2) and high (TiO2) refractive index materials was prepared by sol-gel dip coating method that controls the thickness of each layer with nanometer level. The photonic band gap of high reflectivity was verified at wavelengths between 590 nm and 820 nm, which became significant with increasing the number of bilayer. The UV-vis spectra, SEM image and glow discharge optical emission spectroscopy indicate the periodic structure of SiO2/TiO2 multilayer. The magnetic layer of CoFe2O4 was also prepared by a sol-gel dip coating method. After the annealing at 700 °C, the single phase of CoFe2O4 film with spinel structure, without any preferred crystalline orientation, was obtained. In addition, the one-dimensional magnetophotonic crystal (MPC), in which the magnetic defect layer of CoFe2O4 is introduced into the periodic structure, was prepared. The light was localized at the magnetic defect due to the interference of the multilayer film, and the localized transmittance was observed around 530 nm. The Faraday rotation of MPC shows a peak at ∼ 570 nm which is close to the localized peak of transmittance. This may correspond to the enhancement of Faraday rotation due to the localization of light.

Original languageEnglish
Pages (from-to)2454-2459
Number of pages6
JournalThin Solid Films
Volume516
Issue number9
DOIs
Publication statusPublished - 2008 Mar 3

    Fingerprint

Keywords

  • CoFeO
  • Magnetophotonic crystal
  • Photonic crystal
  • Sol-gel method

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

Cite this