Journal article

Time-resolved spectroscopy of silver nanocubes: Observation and assignment of coherently excited vibrational modes

Hristina Petrova, Chien-Hua Lin, Suzanna de Liejer, Min Hu, Joseph M McLellan, Andrew R Siekkinen, Benjamin J Wiley, Manuel Marquez, Younan Xia, John E Sader, Gregory V Hartland

JOURNAL OF CHEMICAL PHYSICS | AMER INST PHYSICS | Published : 2007

Abstract

The response of single crystal, cubic silver particles to ultrafast laser-induced heating has been examined experimentally and theoretically. The transient absorption traces display clear modulations due to coherently excited vibrational modes. Nanocube samples with edge lengths smaller than 50 nm show a single modulation, whereas samples larger than 50 nm show two vibrational modes. The results are compared to finite element calculations, where the cubes are modeled as having cubic crystal symmetry with the principal axes parallel to the sides of the particle. The action of the laser pulse is treated in two ways, first, as creating a uniform initial strain. In this case the predominant mode..

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University of Melbourne Researchers