Magnetorefractive effect in magnetophotonic crystals
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J5.3.1
Magnetorefractive effect in magnetophotonic crystals Sergey G. Erokhin1, Yulia V. Boriskina1, Alexander B. Granovsky1, Alexey P. Vinogradov2, (George) X.S. Zhao3 and Mitsuteru Inoue4 1 Magnetism Department, Faculty of Physics, M.V.Lomonosov Moscow State University, 119992, GSP-2, Leninskie Gory, Moscow, Russia 2 Institute of Theoretical and Applied Electromagnetism, OIVT, Russian Academy of Sciences, 125412, Moscow, Izhorskay 13/19, Russia 3 Department of Chemical and Biomolecular Engineering, Faculty of Engineering, National University of Singapore, Singapore 117576 4 Toyohashi University of Technology, 1-1 Hibari-Ga-Oka, Tempaku, Toyohashi, Aichi 4418580, Japan ABSTRACT The magnetorefractive effect in one-dimensional magnetophotonic crystals was investigated at a wavelength of about 3 µm. It is shown that the magnitude of magnetorefractive effect can be increased to 10-15 times in comparison with one magnetic layer of the same thickness positioned on a metallic mirror. INTRODUCTION Over the last few years, photonic crystals have attracted a great deal of interest because of their promising applications in photonics, optoelectronics, and microelectronics. These one-, two- and three-dimensionally ordered structures with a periodicity comparable with the wavelengths of incident electromagnetic radiation are made from non-light absorbing materials with different refractive indices. Recently, magnetophotonic crystals (MPCs) fabricated from magnetic components have been studied [1,2]. MPCs are promising and prospective components of photonic devices as they not only have magnetooptical effects such as the Faraday and Kerr effects [3-5] and the optical Hall effect, but also allow tuning optical properties such as band gap in the presence of an external magnetic field. One of most interesting materials for magnetophotonic applications is magnetic nanocomposites because of their giant magnetoresistance, giant anomalous Hall effect, and significant magnetooptical activity. These magnetic nanocomposites consist of ferromagnetic metallic granules chaotically distributed in a para- or diamagnetic matrix of dielectric. We have been interested in magnetorefractive effect (MRE) of MPCs. The MRE is a frequency analog of the giant magnetoresistance and is manifested by changes in light reflectance, transmittance, and absorbance for samples with a considerable magnetoresistance upon magnetization[6,7]. Traditional magnetooptical effects are associated with the influence of spin–orbit interaction on intraband and interband optical transitions. However, the MRE is due to spin-dependent scattering or tunneling and is much larger than traditional magnetooptical effects. In this article, we show theoretically that the MRE can easily be increased to 10-15 times in one-dimensional MPCs with built-in nanocomposite layer in comparison with the MRE in one nanocomposite layer. As a result the change of light reflectance for such MPCs by applying magnetic field can reach more than 60%.
J5.3.2
Figure 1 MPC (SiO2 /Ta 2 O5 ) 6 / M /(Ta
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