6533b83afe1ef96bd12a7b88
RESEARCH PRODUCT
Vibrations of free and embedded anisotropic elastic spheres:Application to low-frequency Raman scattering of silicon nanoparticles in silica
Saviot LucienM.c. Marco De LucasDaniel B. Murraysubject
Materials scienceSilicon[ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]FOS: Physical scienceschemistry.chemical_element02 engineering and technology01 natural sciencesMolecular physicsLight scatteringsymbols.namesakeOptics0103 physical sciencesLibration010306 general physicsAnisotropy63.22.+m78.30.-j43.20.+g02.70.NsCondensed Matter - Materials Sciencebusiness.industryIsotropyMaterials Science (cond-mat.mtrl-sci)021001 nanoscience & nanotechnologyCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsX-ray Raman scatteringchemistrysymbols[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]0210 nano-technologyRaman spectroscopybusinessRaman scatteringdescription
Vibrational mode frequencies and damping are calculated for an elastic sphere embedded in an infinite, homogeneous, isotropic elastic medium. Anisotropic elasticity of the sphere significantly shifts the frequencies in comparison to simplified calculations that assume isotropy. New low-frequency Raman light scattering data are presented for silicon spheres grown in a ${\mathrm{SiO}}_{2}$ glass matrix. Principal features of the Raman spectrum are not correctly described by a simple model of the nanoparticle as a free, isotropic sphere, but require both matrix effects and the anisotropy of the silicon to be taken into account. Libration, not vibration, is the dominant mechanism.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2004-01-01 |