Polarization-dependent ultrafast carrier dynamics in GaAs with anisotropic response |
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| Affiliation: | 1.Strong-field and Ultrafast Photonics Laboratory, Key Laboratory of Trans-scale Laser Manufacturing Technology, Ministry of Education, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China;2.Strong-field and Ultrafast Photonics Laboratory, Beijing Engineering Research Center of Laser Technology, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China |
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| Abstract: | The transient dynamics of anisotropic properties of GaAs was systematically studied by polarization-dependent ultrafast time-resolved transient absorption. Our findings revealed that the anisotropy of reflectivity was enhanced in both pump-induced and probe-induced processes, suggesting an extraordinary resonance absorption of photon-phonon coupling (PPC) with intrinsic anisotropic characteristic in carrier relaxation, regardless of the concrete crystallinity and orientation of GaAs sample. The results, delivering in-depth cognition about the polarization-dependent ultrafast carrier dynamics, also proved the paramount importance of interaction between polarized laser and semiconductor. |
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| Keywords: | ultrafast pump-probe polarization-dependence photon-phonon coupling GaAs |
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