Vibrational Modes of Metal Nanoshells

	Nanotech 2005 Vol. 2 Technical Proceedings of the 2005 NSTI Nanotechnology Conference and Trade Show, Volume 2 Chapter 1: Nano Particles and Molecules
	Vibrational Modes of Metal Nanoshells
Authors:	A.S. Kirakosyan and T.V. Shahbazyan
Affilation:	Jackson State University, US
Pages:	42 - 45
Keywords:	nanoshells, vibrational modes, ultrafast spectroscopy
Abstract:	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 anti-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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ISBN:	0-9767985-1-4
Pages:	808
Hardcopy:	$109.95

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