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.
Degenerate pump-probe experiments have been performed with HgCdTe and GaInNAs thin films. The differential
transmission versus probe delay time shows a negative value for both films, indicating photoinduced absorption from the
trap states. After the negative minimum the differential transmission resumes to zero with long time constants. A rate
equation formalism has been employed to model 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 the
equilibrium state with a single time constant of 1.2 ns, while those in HgCdTe shows two time constants of 0.9 ns and 13
ps, respectively. This implies that there exist two types of deep level traps, fast and slow, in HgCdTe thin films.
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