Femtosecond dynamics of semiconductor microcavity polaritons

Evgenyi A. Vinogradov; V. M. Farztdinov; A. L. Dobryakov; S. A. Kovalenko; Yurii E. Lozovik; Yu. A. Matveets

doi:10.1117/12.341452

5 March 1999 Femtosecond dynamics of semiconductor microcavity polaritons

Evgenyi A. Vinogradov, V. M. Farztdinov, A. L. Dobryakov, S. A. Kovalenko, Yurii E. Lozovik, Yu. A. Matveets

Proceedings Volume 3735, ICONO '98: Ultrafast Phenomena and Interaction of Superstrong Laser Fields with Matter: Nonlinear Optics and High-Field Physics; (1999) https://doi.org/10.1117/12.341452
Event: ICONO '98: Laser Spectroscopy and Optical Diagnostics: Novel Trends and Applications in Laser Chemistry, Biophysics, and Biomedicine, 1998, Moscow, Russian Federation

Abstract

Dynamics of semiconductor microcavity modes in ZnS-Ni structure was investigated by femtosecond pump-supercontinuum probe spectroscopy in wide spectral region 1.6 - 3.2 eV. The change of reflectivity of the ZnS thin films (of 0.29 micrometer, 1.08 micrometer and 1.17 micrometer) on thick Ni film on quartz substrate was monitored. Two different pumping photon energies $HBAR(omega) _pul equals 2.75 eV and $HBAR(omega) _pu2 equals 5.5 eV were used for the excitation of the microcavity and produced different photoresponse spectra. The first pumping energy (2.75 eV) is lower than the energy gap of ZnS (3.7 eV) and the powerful laser pulse excites mainly electrons of metal (i.e. boundary of the microcavity) and of ZnS layer (by two-photon absorption). Nonequilibrium carriers of metal penetrate through Schottky electron barrier into the semiconductor. For the second pumping energy (5.5 eV) the pumping pulse is practically totally absorbed in thin surface ZnS layer of 40 nm in thickness and creates nonhomogeneous hot carriers distribution semiconductor. The differences in the processes of carrier excitation are responsible for the differences in the changes of dielectric function of ZnS and Ni and for the differences in the change of cavity modes.

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Evgenyi A. Vinogradov, V. M. Farztdinov, A. L. Dobryakov, S. A. Kovalenko, Yurii E. Lozovik, and Yu. A. Matveets "Femtosecond dynamics of semiconductor microcavity polaritons", Proc. SPIE 3735, ICONO '98: Ultrafast Phenomena and Interaction of Superstrong Laser Fields with Matter: Nonlinear Optics and High-Field Physics, (5 March 1999); https://doi.org/10.1117/12.341452

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