Nano Science and Technology Institute
Nanotech 2005 Vol. 2
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.
Vibrational Modes of Metal NanoshellsView PDF of paper
ISBN:0-9767985-1-4
Pages:808
Hardcopy:$109.95
 
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