LiNbO_3単結晶上の非線形弾性表面波で見られるソリトン的な振舞の実験的検証

摘要

From viewpoint of complex system, behavior of nonlinear surface acoustic wave has been much interested in application to engineering field of next-generation. 2nd harmonic in nonlinear surface acoustic wave on a LiNbO_3 single crystal shows nonlinear behavior as solitary wave. In this work, dynamic behavior of nonlinear surface acoustic pulses on LiNbO_3 single crystal was investigated and then it was found that the waveform of a 2nd harmonic kept sharp pulse rather than that of fundamental even when their pulses were propagated in the dispersive region.%波動現象の非線形的な振舞を複雑系的な視点で捉え，それを次世代の工学的応用につなげる試みが始　まっている.我々は，レーザープローブ法を用いたLiNbO_3単結晶上の非線形弾性表面波の伝搬特性の評価から，第二次高調波がソリトン的な振舞を示すことを明らかにしている.本研究では，第二次高調波が基本波よりも先鋭なパルス形状を持ち，かつ分散性の影響を受けないことを，パルスの動的特性の結果などを用いて示す.