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Proceedings Paper

Ultrafast nonlinear response of heterostructures based on zinc chalcogenides
Author(s): V. V. Stankevich; M. V. Ermolenko; O. V. Buganov; S. A. Tikhomirov; P. I. Kuznetsov; V. A. Jitov; G. G. Yakushcheva; L. Yu. Zakharov; S. V. Gaponenko
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Paper Abstract

Nonlinear optical response of periodic structures based on ZnSe/ZnS heterostructures using interband excitation of a ZnSe sublattice by 1 50 fs laser pulses is reported. A considerable shift of reflection spectrum and large relative reflection changes were observed in a wide spectral range corresponding to the transparency region of ZnSe far from the intrinsic absorption onset. Evaluated refraction index change is about -0.02 with the relaxation time being about 3 picoseconds. The nonlinear refraction is supposed to be controlled by population induced absorption changes in ZnSe single crystals and relevant refraction index modification via Kramers-Kronig relations. The nonlinearity relaxation time is supposed to trace a transition from non-equilibrium to quasi-equilibrium distribution of electrons and holes within ZnSe conduction and valence bands, respectively, rather than electron-hole recombination time. The nonlinearity mechanism does not reduce to just population dependent absorption saturation but essentially results from the specific distribution function in the first instance after excitation.

Paper Details

Date Published: 9 June 2006
PDF: 7 pages
Proc. SPIE 6258, ICONO 2005: Novel Photonics Materials: Physics and Optical Diagnostics of Nanostructures, 625803 (9 June 2006); doi: 10.1117/12.676817
Show Author Affiliations
V. V. Stankevich, Institute of Molecular and Atomic Physics (Belarus)
M. V. Ermolenko, Institute of Molecular and Atomic Physics (Belarus)
O. V. Buganov, Institute of Molecular and Atomic Physics (Belarus)
S. A. Tikhomirov, Institute of Molecular and Atomic Physics (Belarus)
P. I. Kuznetsov, Institute of Radioengineering and Electronics (Russia)
V. A. Jitov, Institute of Radioengineering and Electronics (Russia)
G. G. Yakushcheva, Institute of Radioengineering and Electronics (Russia)
L. Yu. Zakharov, Institute of Radioengineering and Electronics (Russia)
S. V. Gaponenko, Institute of Molecular and Atomic Physics (Belarus)


Published in SPIE Proceedings Vol. 6258:
ICONO 2005: Novel Photonics Materials: Physics and Optical Diagnostics of Nanostructures
Valentin Dmitriev; Vladimir Shalaev; Vladimir Shuvalov; Nikolay Zheludev, Editor(s)

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