Degenerate four wave mixing spectroscopy of oxygen vibrations in amorphous silicon

TitleDegenerate four wave mixing spectroscopy of oxygen vibrations in amorphous silicon
Publication TypeJournal Article
Year of Publication2004
AuthorsJ.PR Wells, E.D van Hattum, P.J Phillips, D.A Carder, F Habraken, J.I Dijkhuis
JournalJournal of Luminescence
Volume108
Number1-4
Pagination173-176
Date PublishedJun
Type of ArticleArticle
ISBN Number0022-2313
Accession NumberISI:000221572000034
Keywordsamorphous silicon, coherent transient, electron laser, free, vibrational dynamics
Abstract

We report on DFWM spectroscopy on the asymmetric stretching mode in a-SiOx with x from 0.1 to 1.11. For a-SiO0.1, a 10 K lifetime of 2.8 ps is obtained using laser-induced transient grating spectroscopy. Two-pulse photon echo measurements reveal phase dynamics having a temperature dependent component due to elastic phonon scattering and an excitation dependent component suggesting the presence of non-equilibrium Si-Si modes. At high excitation densities, the DFWM signal is dominated by a quasi-thermal grating whose population decay is extremely long lived (much greater than 1 ns). This effect is enhanced as the oxygen concentration is increased. (C) 2004 Elsevier B.V. All rights reserved.

URL<Go to ISI>://000221572000034
Division

GUTHz

Department

FELIX

PID

e1f63e7e8d8b7383f09ae3ac9961d45f

Alternate TitleJ. Lumines.

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