ソニック結晶並びにフォトニック結晶を含む2次元人工結晶における導波路過渡特性の考察(<特集>ディジタルデータ付き論文特集)
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概要
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我々は,2次元ソニック結晶をフォトニック結晶との対応関係に注目しながら解析し,実験的検証を行っている.この論文では,最初に,2次元縦波音場と電磁界の対応関係に注目し,2次元ソニック結晶とフォトニック結晶の特性を決める共通なパラメータ空間を導入し,典型的なソニック結晶である空気中剛体円柱の周期配列と,典型的なフォトニック結晶である空気中GaAs円柱の周期配列が,共通パラメータ空間において大きく性質の異なる領域に属することを示している.次に,有限差分時間領域(FDTD)法を用いて得られる波動場分布の動画像を示しながら,これらの人工結晶によって形成される導波路,特に急しゅんな曲がり導波路を伝搬する音波と光の定常特性並びに過渡特性を比較し論じている.この過渡特性は,高速なスイッチングを含む機能性導波路の設計指針となる重要な特性であると考えられる.
- 2002-10-01
著者
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