In a high-quality thin film crystal, waves due to electronic excitation are not scattered, and spread as excitation waves over a sample of several hundreds (nm) thickness. Where the phase relationship between the excitation wave and the internal light matches, the coupling between the light and the excitons is specifically strengthened, and it is expected that the excited state emits light and relaxes at an ultra high speed. This high-speed response can be used as an optical switch that controls light by light, which leads to an improvement in optical communication speed. In this study, theoretical calculation of nonlinear optical response is performed using anthracene, which has strong interaction with light.
良質な薄膜結晶中では、電子励起による波動が散乱されず、数百(nm)の厚さの試料全体にわたって励起波動として広がる。励起波動と内部光の位相関係が整合するところで光と励起子の結合が特異的に強くなり、励起状態が超高速に光を放出して緩和することが期待される。この高速応答は、光を光で制御する光スイッチとして利用可能であり、光通信速度の向上に繋がる。本研究では、光との相互作用が強いアントラセンを用いて、非線形光学応答の理論計算を行う。