Ultrafast differential-transmission spectroscopy of excitons in strained ZnSe layers and Zn1-xCdxSe/ZnSe quantum wells

Ulrich Neukirch; Kai Wundke; D. Weckendrup; Juergen Gutowski; D. Hommel; Gottfried Landwehr

doi:10.1117/12.200996

9 February 1995 Ultrafast differential-transmission spectroscopy of excitons in strained ZnSe layers and Zn1-xCdxSe/ZnSe quantum wells

Ulrich Neukirch, Kai Wundke, D. Weckendrup, Juergen Gutowski, D. Hommel, Gottfried Landwehr

Author Affiliations +

Proceedings Volume 2362, International Conference on Excitonic Processes in Condensed Matter; (1995) https://doi.org/10.1117/12.200996
Event: Excitonic Processes in Condensed Matter: International Conference, 1994, Darwin, Australia

Abstract

The nonlinear optics of excitons in ZnSe-based heterostructures is investigated by means of fast femtosecond and narrow-band picosecond differential transmission spectroscopy. Pulse lengths amount to 100 fs and 1 ps, respectively. Results taken at Zn_1-xCd_xSe/ZnSe quantum wells, ZnSe layers with ZnS_xSe_1-x cladding, and ZnSe epilayers are presented and discussed. Because of strain relaxation the usual bleaching of the excitonic absorption observed in quantum wells and waveguide-type structures reverses into an induced absorption in case of thick ZnSe epilayers. This phenomenon is discussed by use of a simple empirical model for the optical absorption of a set of inhomogeneously broadened Lorentz oscillators which react on the local exciton density with a nonlinear damping and a reduction of the oscillator strength. Additionally, a very fast change in transmission observed in the waveguide-type structures is discussed in terms of the resonant optical Stark effect.

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Ulrich Neukirch, Kai Wundke, D. Weckendrup, Juergen Gutowski, D. Hommel, and Gottfried Landwehr "Ultrafast differential-transmission spectroscopy of excitons in strained ZnSe layers and Zn1-xCdxSe/ZnSe quantum wells", Proc. SPIE 2362, International Conference on Excitonic Processes in Condensed Matter, (9 February 1995); https://doi.org/10.1117/12.200996

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