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