title: Coherent acoustic vibration of metal nanoshells.
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.
authors.affiliation: Centre de Physique Moléculaire Optique et Hertzienne CNRS and Université Bordeaux I, 351 cours de la Libération, 33405 Talence, France.
authors.forename: C
authors.initials: C
authors.lastname: Guillon
authors.forename: P
authors.initials: P
authors.lastname: Langot
authors.forename: N
authors.initials: N
authors.lastname: Del Fatti
authors.forename: F
authors.initials: F
authors.lastname: Vallée
authors.forename: A S
authors.initials: AS
authors.lastname: Kirakosyan
authors.forename: T V
authors.initials: TV
authors.lastname: Shahbazyan
authors.forename: T
authors.initials: T
authors.lastname: Cardinal
authors.forename: M
authors.initials: M
authors.lastname: Treguer
mesh_terms: D000162:Acoustics; D008670:Metals / Q000737:chemistry*; D049329:Nanostructures; D014732:Vibration
chemical_list: D008670:Metals