Ultrafast nonlinear response of heterostructures based on zinc chalcogenides

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

doi:10.1117/12.676817

9 June 2006 Ultrafast nonlinear response of heterostructures based on zinc chalcogenides

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

Author Affiliations +

Proceedings Volume 6258, ICONO 2005: Novel Photonics Materials: Physics and Optical Diagnostics of Nanostructures; 625803 (2006) https://doi.org/10.1117/12.676817
Event: ICONO 2005, 2005, St. Petersburg, Russian Federation

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.

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V. V. Stankevich, M. V. Ermolenko, O. V. Buganov, S. A. Tikhomirov, P. I. Kuznetsov, V. A. Jitov, G. G. Yakushcheva, L. Yu. Zakharov, and S. V. Gaponenko "Ultrafast nonlinear response of heterostructures based on zinc chalcogenides", Proc. SPIE 6258, ICONO 2005: Novel Photonics Materials: Physics and Optical Diagnostics of Nanostructures, 625803 (9 June 2006); https://doi.org/10.1117/12.676817

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KEYWORDS

Absorption

Picosecond phenomena

Plasma

Refractive index

Heterojunctions

Nonlinear response

Refraction

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