Transmission Modulation of Micro Retarder Using Out-of-Plane Thermally-Driven Au Nanograting

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  • 面外熱駆動Auナノグレーティングを用いたマイクロ光学位相子の透過率変調
  • メン ガイ ネツ クドウ Au ナノグレーティング オ モチイタ マイクロ コウガクイ アイコ ノ トウカリツ ヘンチョウ

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Abstract

<p>A reconfigurable transmittance modulation device for Au nanograting retarder that consisted of out-of-plane thermally-driven grating was designed, fabricated, and demonstrated. In this study, an Au nanograting that is known to exhibit giant birefringence was constituted by integrating MEMS thermal actuators. The thermally-driven grating was made of Au/SiO2 bimorph beams that period and slit width are 800 nm and 400 nm, respectively. The device is fabricated on a glass substrate with embedded Si as a sacrificial layer. The gap between the grating and the substrate is changed by applying driving current, and transmittance was changed affected by Fabry-Pérot interference. Transmittance peak wavelength for TE polarization was shifted up to 40 nm keeping the retardation of the Au nanograting. A calculation model of transmittance applying multilayer interference was proposed and demonstrated its effectiveness in TE polarization. By optimizing the design dimensions of the Au nanograting, it is expected to realize a microscale waveplate capable of transmittance modulation.</p>

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