Observation of Enhanced Faraday Effect in Garnet-Based Magnetophotonic Crystals
- PDF / 168,429 Bytes
- 4 Pages / 595 x 842 pts (A4) Page_size
- 116 Downloads / 218 Views
J1.5.1
Observation of Enhanced Faraday Effect in Garnet-Based Magnetophotonic Crystals A. A. Fedyanin1, D. Kobayashi2, K. Nishimura2, H. Uchida2, M. Inoue2, O. A. Aktsipetrov1 1 Moscow State University, Moscow 119992, Russia 2 Toyohashi University of Technology, Toyohashi, Japan ABSTRACT The fabrication of one-dimensional magnetophotonic crystals (MPC) composed from Bisubstituted yttrium-iron-garnet films separated by the silicon oxide layers is presented. The enhancement of the Faraday rotation angle is observed at the spectral regions of the photonic band gap edges. The effective Faraday rotation achieves the values up to 1.5 degrees per micron at 1100-nm-wavelength. INTRODUCTION The fabrication of magnetophotonic crystals (MPC), which are photonic crystals formed from magnetic materials, is one of intensively developing area of research of photonic band gap (PBG) materials [1]. MPC provide a powerful means to control the light propagation flexible under external magnetic field. New phenomena, which are expected to be observed in MPC, are the tunability of PBG under magnetic field application and enhancement of magneto-optical response, such as Faraday effect, utilizing the nonreciprocity of the light propagation in magnetic medium [2-5]. Therefore, MPC open up prospects for new spintronic devices utilizing magnetooptical effects, such as compact optical isolators, switchers and magnetic field sensors. Several ways of fabrication of MPC have been proposed. These include the templating the aqueous ferrofluid containing magnetic nanoparticles three-dimensional lattice assembled from polystyrene or silica spheres or direct synthesis of magnetic materials in pores of artificial opals. One of the type of the solid-state MPC, where the enhancement of magneto-optical effects is observed, is one-dimensional MPC with the half-wavelength-thick defect layer formed from ferromagnetic material and the Bragg reflectors composed from nonmagnetic materials [2,5]. Such MPC act as magnetic photonic-crystal microcavities and have a resonant optical transition microcavity mode, located in the PBG. Spatial localization of the optical wave resonant to the microcavity mode leads to the Faraday effect enhancement observed in MPC with the magnetic garnet [2] and Co-ferrite [6] spacers. One of the difficulties of fabrication of magnetic Bragg reflectors is the magnetic film thickness control critical for the Bragg reflector quality. Another problem is the requirement of the transparent magnetic materials. Bi-substituted yttrium-irongarnet (Bi:YIG) films are very convenient materials for the MPC fabrication due to low absorption in red and infrared regions, large magneto-optical response and small saturation magnetic fields. In this paper, the fabrication of magnetophotonic crystals formed from Bisubstituted yttrium-iron-garnet layers is reported [7]. Enhancement of the Faraday effect in such MPC is studied. EXPERIMENTAL DETAILS MPC are fabricated from four repeats of Bi-substituted yttrium-iron-garnet, Bi1.0Y2.0Fe5Ox, and SiO2 layers. Thi
Data Loading...
