title: Time-resolved photodynamics of triangular-shaped silver nanoplates.
abstract: We measured the ultrafast response of triangular silver nanoparticles upon femtosecond excitation of their plasmon resonance. After a fast electron relaxation, the signature of a bimodal mechanical vibration of the particle is apparent as a spectral modulation. We identify the two lowest frequency, totally symmetric vibrations of the particle as responsible for this modulation, through their influence on the plasmon peak position and width, in full agreement with the results of a variational elastodynamic model that is also presented. From the analysis of the phase we conclude that thermal expansion and electron pressure, respectively, are responsible for the excitation of the two vibrations.
authors.affiliation: Laboratoire de Spectroscopie Ultrarapide, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
authors.forename: Luigi
authors.initials: L
authors.lastname: Bonacina
authors.forename: Andrea
authors.initials: A
authors.lastname: Callegari
authors.forename: Camilla
authors.initials: C
authors.lastname: Bonati
authors.forename: Frank
authors.initials: F
authors.lastname: van Mourik
authors.forename: Majed
authors.initials: M
authors.lastname: Chergui