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Proceedings Paper

Femtosecond dynamics of semiconductor microcavity polaritons
Author(s): Evgenyi A. Vinogradov; V. M. Farztdinov; A. L. Dobryakov; S. A. Kovalenko; Yurii E. Lozovik; Yu. A. Matveets
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Paper 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.

Paper Details

Date Published: 5 March 1999
PDF: 8 pages
Proc. SPIE 3735, ICONO '98: Ultrafast Phenomena and Interaction of Superstrong Laser Fields with Matter: Nonlinear Optics and High-Field Physics, (5 March 1999); doi: 10.1117/12.341452
Show Author Affiliations
Evgenyi A. Vinogradov, Institute of Spectroscopy (Russia)
V. M. Farztdinov, Institute of Spectroscopy (Russia)
A. L. Dobryakov, Institute of Spectroscopy (Russia)
S. A. Kovalenko, Max-Planck-Institut fuer Biophysikalische Chemie (Germany)
Yurii E. Lozovik, Institute of Spectroscopy (Russia)
Yu. A. Matveets, Institute of Spectroscopy (Russia)


Published in SPIE Proceedings Vol. 3735:
ICONO '98: Ultrafast Phenomena and Interaction of Superstrong Laser Fields with Matter: Nonlinear Optics and High-Field Physics
Mikhail V. Fedorov; Vyacheslav M. Gordienko; Vladimir V. Shuvalov; Vladimir D. Taranukhin, Editor(s)

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