標題: | 2-D modeling of dual-mode acoustic phonon excitation of a triangular nanoplate |
作者: | Tai, Po-Tse Yu, Pyng Tang, Jau 光電工程學系 Department of Photonics |
關鍵字: | Ultrafast phenomena;Coherent phonon;Photoacoustic effects;Laser heating |
公開日期: | 23-八月-2010 |
摘要: | In this theoretical work, we investigated coherent phonon excitation of a triangular nanoplate based on 2-D Fermi-Pasta-Ulam lattice model. Based on the two-temperature model commonly used in description of laser heating of metals, we considered two kinds of forces related to electronic and lattice stresses. Based on extensive simulation and analysis, we identified two major planar phonon modes, namely, a standing wave mode related to the triangle bisector and another mode corresponding to half of the side length. This work elucidates the roles of laser-induced electronic stress and lattice stress in controlling the initial phase and the amplitude ratio between these two phonon modes. (C) 2010 Elsevier B.V. All rights reserved. |
URI: | http://dx.doi.org/10.1016/j.chemphys.2010.07.010 http://hdl.handle.net/11536/32285 |
ISSN: | 0301-0104 |
DOI: | 10.1016/j.chemphys.2010.07.010 |
期刊: | CHEMICAL PHYSICS |
Volume: | 374 |
Issue: | 1-3 |
起始頁: | 126 |
結束頁: | 130 |
顯示於類別: | 期刊論文 |