Spectroscopy of vibrational modes in metal nanoshells

Details Spectroscopy of vibrational modes in metal nanoshells Spectroscopy of vibrational modes in metal nanoshells

2006-08-16

arxiv.org/abs/cond-mat/0608361v1

Invited paper in special issue "Optics on the Nanoscale", Applied Physics B: Lasers and Optics, 84, 117-120 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1007/s00340-006-2180-7

We study the spectrum of vibrational modes in metal nanoparticles with a dielectric core. Vibrational modes are excited by the rapid heating of the particle lattice that takes place after laser excitation, and can be monitored by means of pump-probe spectroscopy as coherent oscillations of transient optical spectra. In nanoshells, the presence of two metal surfaces results in a substantially different energy spectrum of acoustic vibrations than for solid particles. We calculated the energy spectrum as well as the damping of nanoshell vibrational modes. The oscillator strength of fundamental breathing mode is larger than that in solid nanoparticles. At the same time, in very thin nanoshells, the fundamental mode is overdamped due to instantaneous energy transfer to the surrounding medium.

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