Abstract
Zinc oxide (ZnO) is a promising material for combining with magneto-optic (MO) materials because it can propagate stable exciton-polaritons, with velocities considerably lower than that of photons in a vacuum. This study investigated the influence of sputtered ZnO and Al:ZnO top layers on MO responses of a bismuth-substituted yttrium iron garnet (Bi:YIG) film. The ZnO top layer modulated the Faraday rotation and magnetic circular dichroism (MCD) of the Bi:YIG around the exciton resonance wavelength of ZnO at 369 nm. Furthermore, Al-substituted ZnO, which is a conductive ZnO, also changed the MO effects around the exciton resonance wavelength. These results imply that the exciton-polaritons in ZnO affect the MO interaction, because of their considerably low group velocity. The results suggest potential for controlling the MO response via excitons.
Highlights
The magneto-optic (MO) effect is widely used in optical applications
Enhancement or modulation of the MO effect was reported in hybrid structures of MO materials with metallic [1,2,3]
These kinds of structures attract a great deal of interest because they possess advanced functional capabilities for optical devices
Summary
Enhancement or modulation of the MO effect was reported in hybrid structures of MO materials with metallic [1,2,3]. Dielectric materials [4,5,6]. These kinds of structures attract a great deal of interest because they possess advanced functional capabilities for optical devices. One method of changing MO responses is to localize the light in or around MO materials. Localization of light extends the time for interaction between light and MO media and, MO responses can be modulated. In earlier studies [1,2,3,4,5,6], plasmon resonance and photonic crystals were used to localize the light
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