Coherent oscillations of vibrational modes in core-shell nanoparticles

Arman S. Kirakosyan; Tigran V. Shahbazyan

doi:10.1117/12.588098

31 March 2005 Coherent oscillations of vibrational modes in core-shell nanoparticles

Arman S. Kirakosyan, Tigran V. Shahbazyan

Proceedings Volume 5703, Plasmonics in Biology and Medicine II; (2005) https://doi.org/10.1117/12.588098
Event: SPIE BiOS, 2005, San Jose, CA, United States

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 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.

Citation Download Citation

Arman S. Kirakosyan and 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

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KEYWORDS

Nanoparticles

Particles

Dielectrics

Solids

Metals

Oscillators

Gold

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