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Raman scattering of acoustical modes of silicon nanoparticles embedded in silica matrix
Author(s) -
Ivanda M.,
Hohl A.,
Montagna M.,
Mariotto G.,
Ferrari M.,
Crnjak Orel Z.,
Turković A.,
Furić K.
Publication year - 2006
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1445
Subject(s) - raman scattering , raman spectroscopy , silicon , molecular physics , resonance (particle physics) , materials science , quantum dot , x ray raman scattering , coherent anti stokes raman spectroscopy , phonon , scattering , matrix (chemical analysis) , excitation , condensed matter physics , optics , chemistry , atomic physics , nanotechnology , physics , optoelectronics , composite material , quantum mechanics
The Raman scattering from acoustical phonons of silicon quantum dots in glass matrix was investigated. Two peaks that correspond to symmetric and quadrupolar spheroidal vibrations were found. A model calculation for in‐ and off‐resonance scattering conditions was used, which considered the homogeneous broadening due to interaction with matrix and the inhomogeneous broadening due to particle size distribution. A strong dependence of the light‐to‐vibration coupling coefficient on the particles size was needed for fitting the Raman data. This result suggests that resonance with electronic transitions of the silicon nanoparticles is important for excitation at 514.5 nm. The size distribution obtained from the Raman data is in agreement with the results of high‐resolution transmission electron microscopy. Copyright © 2006 John Wiley & Sons, Ltd.