Coherent acoustic vibration of metal nanoshells |
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Authors: | Guillon C Langot P Del Fatti N Vallée F Kirakosyan A S Shahbazyan T V Cardinal T Treguer M |
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Affiliation: | Centre de Physique Moléculaire Optique et Hertzienne CNRS and Université Bordeaux I, 351 cours de la Libération, 33405 Talence, France. |
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Abstract: | 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. |
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