Ultrafast heavy hole-phonon interactions in highly n-doped GaAs have been selectively studied with femtosecond absorption saturation measurements by tuning the pump-probe photon energy just above the doped electron Fe...Ultrafast heavy hole-phonon interactions in highly n-doped GaAs have been selectively studied with femtosecond absorption saturation measurements by tuning the pump-probe photon energy just above the doped electron Fermi edge.A heavy hole-phonon scattering time of~300fs has been measured,which is consistent with that calculated by a numerical model.Accordingly,an optical deformation potential of about 31 eV has been estimated for this highly n-doped sample.展开更多
Optical storage caused by photo-induced anisotropy in poly[3-methyl-4-bis(N,N-oxyethylene)imino-4-nitro-azobenzene sebacoyl]film is studied by degenerate four-wave mixing.Molecule orientation gratings which are stable...Optical storage caused by photo-induced anisotropy in poly[3-methyl-4-bis(N,N-oxyethylene)imino-4-nitro-azobenzene sebacoyl]film is studied by degenerate four-wave mixing.Molecule orientation gratings which are stable for three months are produced.The grating in the sample can be“erased”by using circular polarized light.So an azobenzene polymer thin film can be used many times to restore optical information.展开更多
The ultrafast exciton trapping dynamics in ZnSe/ZnCdSe short period superlattice quantum wells has been studied by using transient photoluniinescence spectroscopy.A rapid exciton trapping time of less than 7 ps from t...The ultrafast exciton trapping dynamics in ZnSe/ZnCdSe short period superlattice quantum wells has been studied by using transient photoluniinescence spectroscopy.A rapid exciton trapping time of less than 7 ps from the barriers to the wells is measured.In Te doped samples self-trapped excitons give rise to Stokes shifted broad band luminescence and exhibit much longer lifetime.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No.69676015.
文摘Ultrafast heavy hole-phonon interactions in highly n-doped GaAs have been selectively studied with femtosecond absorption saturation measurements by tuning the pump-probe photon energy just above the doped electron Fermi edge.A heavy hole-phonon scattering time of~300fs has been measured,which is consistent with that calculated by a numerical model.Accordingly,an optical deformation potential of about 31 eV has been estimated for this highly n-doped sample.
基金Supported by the Natural Science Foundation of Guangdong ProvinceSpecial Research Foundation of Doctorate Station in University of China.
文摘Optical storage caused by photo-induced anisotropy in poly[3-methyl-4-bis(N,N-oxyethylene)imino-4-nitro-azobenzene sebacoyl]film is studied by degenerate four-wave mixing.Molecule orientation gratings which are stable for three months are produced.The grating in the sample can be“erased”by using circular polarized light.So an azobenzene polymer thin film can be used many times to restore optical information.
基金Supported by the National Natural Science Foundation of China.
文摘The ultrafast exciton trapping dynamics in ZnSe/ZnCdSe short period superlattice quantum wells has been studied by using transient photoluniinescence spectroscopy.A rapid exciton trapping time of less than 7 ps from the barriers to the wells is measured.In Te doped samples self-trapped excitons give rise to Stokes shifted broad band luminescence and exhibit much longer lifetime.
