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Proceedings Paper

Ultrafast differential-transmission spectroscopy of excitons in strained ZnSe layers and Zn1-xCdxSe/ZnSe quantum wells
Author(s): Ulrich Neukirch; Kai Wundke; D. Weckendrup; Juergen Gutowski; D. Hommel; Gottfried Landwehr
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Paper 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 Zn1-xCdxSe/ZnSe quantum wells, ZnSe layers with ZnSxSe1-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.

Paper Details

Date Published: 9 February 1995
PDF: 9 pages
Proc. SPIE 2362, International Conference on Excitonic Processes in Condensed Matter, (9 February 1995); doi: 10.1117/12.200996
Show Author Affiliations
Ulrich Neukirch, Univ. Bremen (Germany)
Kai Wundke, Univ. Bremen (Germany)
D. Weckendrup, Univ. Bremen (Germany)
Juergen Gutowski, Univ. Bremen (Germany)
D. Hommel, Univ. Wuerzburg (Germany)
Gottfried Landwehr, Univ. Wuerzburg (Germany)

Published in SPIE Proceedings Vol. 2362:
International Conference on Excitonic Processes in Condensed Matter
Jai Singh, Editor(s)

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