標題: Selective acoustic phonon mode excitation of multi-mode silver nanoprisms
作者: Tai, Po-Tse
Yu, Pyng
Huang, Jane
Tang, Jau
光電工程學系
Department of Photonics
公開日期: 30-八月-2010
摘要: Nanoprisms are known to exhibit two major planar phonon modes in ultrafast experiments, namely, a stronger mode related to the bisector height and a weaker mode related to half of the edge length. In this work we demonstrated photoacoustic excitation of a specific acoustic phonon mode in silver nanoprisms using two properly timed pump pulses. Using this technique, we could selectively excite only the weak totally symmetric mode while suppressing the dominant breathing mode. Via direct observation of such a mode, which is hardly detectable directly with the conventional single pump pulse technique, we could elucidate the roles of hot electrons in photoinduced ultrafast structural dynamics in laser-heated nanoparticles. (C) 2010 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.cplett.2010.07.072
http://hdl.handle.net/11536/32279
ISSN: 0009-2614
DOI: 10.1016/j.cplett.2010.07.072
期刊: CHEMICAL PHYSICS LETTERS
Volume: 496
Issue: 4-6
起始頁: 326
結束頁: 329
顯示於類別:期刊論文


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