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Proceedings Paper

Carrier and phonon dynamics in GaInNAs
Author(s): Fajun Ma
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Paper Abstract

Degenerate pump-probe experiments have been performed on the dynamics of carrier and phonon in GaInNAs thin films. The time-resolved differential transmission shows a negative value, indicating photoinduced absorption from the trap states. After the negative minimum the differential transmission recovers to zero with a long time constant. Rate equation has been employed to simulate the carrier dynamics. The calculations fit the experimental differential transmission very well. The extracted time constants show that the carriers in the trap states of GaInNAs decay to equilibrium with a single time constant of 1.2 ns. An obvious modulation of the transmission signal has been observed superimposing on the photoinduced absorption. Such a modulation is found at a low frequency of 380 GHz by Fourier transform. This low frequency oscillation might be attributed to coherent longitudinal acoustic (LA) phonon.

Paper Details

Date Published: 18 February 2011
PDF: 4 pages
Proc. SPIE 7995, Seventh International Conference on Thin Film Physics and Applications, 799507 (18 February 2011); doi: 10.1117/12.888156
Show Author Affiliations
Fajun Ma, Shanghai Institute of Technical Physics (China)

Published in SPIE Proceedings Vol. 7995:
Seventh International Conference on Thin Film Physics and Applications
Junhao Chu; Zhanshan Wang, Editor(s)

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