| Title | Degenerate four wave mixing spectroscopy of oxygen vibrations in amorphous silicon |
| Publication Type | Journal Article |
| Year of Publication | 2004 |
| Authors | J.PR Wells, E.D van Hattum, P.J Phillips, D.A Carder, F Habraken, J.I Dijkhuis |
| Journal | Journal of Luminescence |
| Volume | 108 |
| Number | 1-4 |
| Pagination | 173-176 |
| Date Published | Jun |
| Type of Article | Article |
| ISBN Number | 0022-2313 |
| Accession Number | ISI:000221572000034 |
| Keywords | amorphous 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 Title | J. Lumines. |
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