Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 4, Pages 792-795Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.792
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We investigate the vibration dynamics of ellipsoidal silver nanoparticles, using time-resolved optical pump-probe spectroscopy. When excited with femtosecond laser pulses, the particles execute anisotropic shape oscillations. We show that these vibrations are triggered by the thermal expansion of the optically heated particles. The time dependence of the vibrations indicates that this expansion is caused by two mechanisms: The lattice anharmonicity and the extremely large pressure of the hot conduction electrons.
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