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We study coherent oscillations of radial breathing modes in metal
nanoparticles with a dielectric core. Vibrational modes are
impulsively excited by a rapid heating of the particle lattice that
occurs after laser excitation, while the energy transfer to a
surrounding dielectric leads to a damping of the oscillations. In
nanoshells, the presence of two metal surfaces leads to a
substantially different energy spectrum of acoustic vibrations. The
lowest and first excited modes correspond to in-phase (n=0) and
out-of-phase (n=1) contractions of shell-core and shell-matrix
interfaces respectively. We calculated the energy spectrum as well as
the damping of nanoshell vibrational modes in the presence of
surrounding medium, and found that the size-dependences of in-phase
and anti-phase modes are different. At the same time, the oscillator
strength of the symmetric mode is larger than that in solid
nanoparticles leading to stronger oscillations in thin nanoshells.
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Arman S. Kirakosyan, Tigran V. Shahbazyan, "Coherent oscillations of vibrational modes in core-shell nanoparticles," Proc. SPIE 5703, Plasmonics in Biology and Medicine II, (31 March 2005); https://doi.org/10.1117/12.588098