Hristina Petrova, Chien-Hua Lin, Susanna De Leijer, Min Hu, Joseph McLellan, Andrew Siekkinen, Benjamin Wiley, Manuel Marquez, Younan Xia, John Sader, Gregory Hartland
Irradiating metal particles by an ultrafast laser pulse produces rapid heating of the lattice. This can lead to coherent
excitation of the vibrational modes of the particle that correlate with the expansion co-ordinates. By comparing the
measured periods to continuum mechanics calculations, these experiments can provide information about the elastic
constants of the particle if the size and shape are known. In this paper recent results are presented for particles with
cubic symmetry, specifically, nanocubes, nanoboxes (hollow cubes) and nanocages (nanoboxes with holes on the
corners and/or facets of the box). The way the vibrational modes are assigned, and the information content of the
experiments will be discussed, as well as the energy relaxation dynamics of the particles. Energy relaxation is
important for the proposed use of the nanocages in phothermal therapy, where heat dissipation following laser excitation
is used to selectively kill cells.
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