Fabry-pérot共振器の導入による透明強磁性Co-MgF<sub>2</sub>グラニュラー薄膜ファラデー効果の増強

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  • Enhancement of Faraday-effect of Transparent Ferromagnetic Co-MgF<sub>2</sub> Granular Film by Introducing Fabry-pérot Resonant Structure
  • Fabry-perot共振器の導入による透明強磁性Co-MgF₂グラニュラー薄膜ファラデー効果の増強
  • Fabry-perot キョウシンキ ノ ドウニュウ ニ ヨル トウメイ キョウジセイ Co-MgF ₂ グラニュラー ハクマク ファラデー コウカ ノ ゾウキョウ
  • Enhancement of Faraday effect of transparent ferromagnetic Co‐MgF<sub>2</sub> granular film by introducing Fabry–Pérot resonant structure

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<p>To detect the magnetic field using polarization of a light, transparent magnetic material having a Faraday-effect is required. The Co-MgF2 granular film is promising as a candidate of the Faraday element for the magnetic field sensing. In this study, Fabry-pérot resonant structure was introduced into the Co-MgF2 granular film to enhance the Faraday-effect. It was found that the Faraday-effect per unit film-thickness [deg./µm] was enhanced due to a light localized in the Co-MgF2 granular layer sandwiched by Bragg-mirror of the insulator multilayer. The maximum Faraday-effect of the proposed structure was -1.24 deg./µm, which was about 3.4 times enhancement compared with a single Co-MgF2 film, when the number of layer period x in Fabry-pérot resonant multilayer was 5, where the structure was substrate/ (Ta2O5/SiO2)x/Co-MgF2/(SiO2/Ta2O5)2/Air. Furthermore, the multi cavity structure, consisting of the Fabry-pérot resonant multilayer film continuously placed, exhibited a 50% increase of Figure of merit (FOM) defined as Faraday-rotation angle per transmission loss [deg./dB].</p>

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