The ultrafast dynamics of surface electromagnetic waves photogenerated on the surfaces of an Al film perforated
with 2D subwavelength hole array was studied by the pump-probe correlation spectroscopy. The time-resolved
differential transmission exhibits a fast rise on subpicosecond time scale followed by a plateau with subsequent
slow decay. This dynamics is accompanied by a blue shift in transient spectra of the anomalous transmision
band. A theoretical model is developed that explains both time-resolved and spectrally-resolved data.
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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