Coherent Acoustic Vibration of Metal Nanoshells

C. Guillon (1) , P. Langot (1) , N. del Fatti (2) , F. Vallée (2) , A. S. Kirakosyan (3) , T. V. Shahbazyan (3) , T. Cardinal (4) , M. Treguer (4)

1 CPMOH - Centre de physique moléculaire optique et hertzienne
2 LASIM - Laboratoire de Spectrométrie Ionique et Moléculaire
3 Department of Physics and Computational, Center for Molecular Structure and Interactions
4 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

Using time-resolved pump-probe spectroscopy, we have performed the first investigation of the vibrational modes of gold nanoshells. The fundamental isotropic mode launched by a femtosecond pump pulse manifests itself in a pronounced time-domain modulation of the differential transmission probed at the frequency of nanoshell surface plasmon resonance. The modulation amplitude is significantly stronger, and the period is longer than that in a gold nanoparticle of the same overall size, in agreement with theoretical calculations. This distinct acoustical signature of nanoshells provides a new and efficient method for identifying these versatile nanostructures and for studying their mechanical and structural properties.

Domaines: Autre [cond-mat.other]

C. Guillon, P. Langot, N. del Fatti, F. Vallée, A. S. Kirakosyan, et al.. Coherent Acoustic Vibration of Metal Nanoshells. Nano Letters, 2007, 7, pp.138. ⟨10.1021/nl062380dS1530-6984(06)02380-0⟩. ⟨hal-00338864⟩