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The wavelength dependence of ultrafast relaxation dynamics of photoexcited carriers in bulk GaAs is studied using femtosecond time-resolved pump-probe transmission spectroscopy under the same photoexcited carrier concentration and the ratio of pump to probe in intensity. Negative and oscillating time-delayed signals are observed at central wavelengths of 760 nm and 780 nm and judged to be incorrect physically by comparson with a simulated computation result. It is found by waveform analysis that they are caused by the phase reversal of the output waveforms from a photodetector, while the phase reversal originates from a long lifetime absorption process existing in GaAs sample. It is pointed out that the phase reversal of the waveform can be corrected by raising the ratio of pump to probe in intensity at the photodetector, so that right transient traces can be obtained. However, raising the ratio is incompatible with the viewpoint that the scattered contribution to the photodetector from pump light should be filtered as much as possible. This result has an important reference value for the acquisition of correct ultrafast dynamics using time-resolved pump-probe spectroscopy.
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Keywords:
- time-resolved pump-probe transmission spectroscopy /
- saturated absorption /
- enhanced absorption /
- bulk GaAs
[1] Wang H C, Lu Y C, Teng C C, Chen Y S, Yang C C, Ma K J, Pan C C, Chyi J I 2005 J. Appl. Phys. 97 033704
[2] [3] Lai T S, Liu X D, Xu H H, Jiao Z X, Wen J H, Lin W Z 2006 Appl. Phys. Lett. 88 192106
[4] [5] Lai T S, Teng L H, Jiao Z X, Xu H H, Lei L, Wen J H, Lin W Z 2007 Appl. Phys. Lett. 91 062110
[6] Yu H L, Zhang X M, Wang P F, Ni H Q, Niu Z C, Lai T S 2009 Appl. Phys. Lett. 94 202109
[7] [8] Stanciu C D, Tsukamoto A, Kimel A V, Hansteen F, Kirilyuk A, Itoh A, Rasing Th 2007 Phys. Rev. Lett. 99 217204
[9] [10] [11] Chen Z F, Gao R X, Wang Z X, Xu C D, Chen D X, Lai T S 2010 J. App.Phys. 108 023902
[12] Lioudakis E, Othonos A, Dimakis E, Lliopoulos E, Georgakilas A 2006 Appl. Phys. Lett. 88 121128
[13] [14] Wilhelmi B, Herrmann J 1980 Sov. J. Quantum Electron. 10 1082
[15] [16] Hunsche S, Heesel H, Ewertz A, Kurz H 1993 Phys. Rev. B 48 17818
[17] [18] [19] Oudar J L, Hulin D, Migus A, Antonetti A 1985 Phys. Rev. Lett. 55 2074
[20] [21] Lin W Z, Fujimoto G, Ippen E P 1987 Appl. Phys. Lett. 50 124
[22] [23] Nagai T, Inagaki T J, Kanemitsu Y 2004 Appl. Phys. Lett. 84 1284
[24] Ganikhanov F, Burr K C, Hiltion D J, Tang C L 1999 Phys. Rev. B 60 8890
[25] [26] [27] Bennett B R, Soref R A, Del Alamo J A 1990 IEEE J. Quantum Electron. 26 113
[28] Prabhu S S, Vengurlekar A S 2004 J. Appl. Phys. 95 7803
[29] [30] Mandelis A, Xia J 2008 J. Appl. Phys. 103 043704
[31] -
[1] Wang H C, Lu Y C, Teng C C, Chen Y S, Yang C C, Ma K J, Pan C C, Chyi J I 2005 J. Appl. Phys. 97 033704
[2] [3] Lai T S, Liu X D, Xu H H, Jiao Z X, Wen J H, Lin W Z 2006 Appl. Phys. Lett. 88 192106
[4] [5] Lai T S, Teng L H, Jiao Z X, Xu H H, Lei L, Wen J H, Lin W Z 2007 Appl. Phys. Lett. 91 062110
[6] Yu H L, Zhang X M, Wang P F, Ni H Q, Niu Z C, Lai T S 2009 Appl. Phys. Lett. 94 202109
[7] [8] Stanciu C D, Tsukamoto A, Kimel A V, Hansteen F, Kirilyuk A, Itoh A, Rasing Th 2007 Phys. Rev. Lett. 99 217204
[9] [10] [11] Chen Z F, Gao R X, Wang Z X, Xu C D, Chen D X, Lai T S 2010 J. App.Phys. 108 023902
[12] Lioudakis E, Othonos A, Dimakis E, Lliopoulos E, Georgakilas A 2006 Appl. Phys. Lett. 88 121128
[13] [14] Wilhelmi B, Herrmann J 1980 Sov. J. Quantum Electron. 10 1082
[15] [16] Hunsche S, Heesel H, Ewertz A, Kurz H 1993 Phys. Rev. B 48 17818
[17] [18] [19] Oudar J L, Hulin D, Migus A, Antonetti A 1985 Phys. Rev. Lett. 55 2074
[20] [21] Lin W Z, Fujimoto G, Ippen E P 1987 Appl. Phys. Lett. 50 124
[22] [23] Nagai T, Inagaki T J, Kanemitsu Y 2004 Appl. Phys. Lett. 84 1284
[24] Ganikhanov F, Burr K C, Hiltion D J, Tang C L 1999 Phys. Rev. B 60 8890
[25] [26] [27] Bennett B R, Soref R A, Del Alamo J A 1990 IEEE J. Quantum Electron. 26 113
[28] Prabhu S S, Vengurlekar A S 2004 J. Appl. Phys. 95 7803
[29] [30] Mandelis A, Xia J 2008 J. Appl. Phys. 103 043704
[31]
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