Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/37875
Title: Acoustic dynamics of nanoparticles and nanostructured phononic crystals
Authors: PAN HUIHUI
Keywords: Brillouin spectroscopy, confined eigenvibrations, phononic crystals, magphonic crystals, bandgaps, finite element simulations
Issue Date: 25-Jan-2013
Source: PAN HUIHUI (2013-01-25). Acoustic dynamics of nanoparticles and nanostructured phononic crystals. ScholarBank@NUS Repository.
Abstract: Brillouin light scattering, a powerful technique for probing hypersonic phonons in nanostructured materials, has been employed to investigate confined acoustic phonons in single-crystal gold nano-octahedra and the surface phonon dispersions in one- and two-dimensional hypersonic phononic crystals. Theoretical investigations, based on the finite element analysis, of the acoustic vibrational modes of gold nano-octahedra and the phonon dispersions of the phononic crystals have also been undertaken. Findings of the gold-octahedra investigation suggests that the eigenfrequencies of any free regular-shaped homogeneous object always scale with its inverse linear dimension, a universal relationship which is valid for such objects of any size in the classical regime. Bragg gap openings and hybridization gaps arising from the avoided crossings of the zone-folded Rayleigh wave and Sezawa wave (or pseudo-Sezawa wave) have been observed for the phononic crystals studied. Our study of a two-dimensional chessboard-patterned phononic crystal reveals hitherto unreported unusual surface optical-like phonon modes.
URI: http://scholarbank.nus.edu.sg/handle/10635/37875
Appears in Collections:Ph.D Theses (Open)

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