Probing the acoustic vibrations of complex-shaped metal nanoparticles with four-wave mixing

Jian Wu, Dao Xiang, Ghazal Hajisalem, Fan Cheng Lin, Jershing Huang, Chun Hong Kuo, Reuven Gordon*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


We probe the acoustic vibrations of silver nanoprisms and gold nano-octahedrons in aqueous solution with four-wave mixing. The nonlinear optical response shows two acoustic vibrational modes: an in-plane mode of nanoprisms with vertexial expansion and contraction; an extensional mode of nano-octahedrons with longitudinal expansion and transverse contraction. The particles were also analyzed with electron microscopy and the acoustic resonance frequencies were then calculated by the finite element analysis, showing good agreement with experimental observations. The experimental mode frequencies also fit with theoretical approximations, which show an inverse dependence of the mode frequency on the edge length, for both nanoprisms and nano-octahedrons. This technique is promising for in situ monitoring of colloidal growth.

Original languageEnglish
Pages (from-to)23747-23754
Number of pages8
JournalOptics Express
Issue number21
StatePublished - 17 Oct 2016


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