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9 February 1995 Ultrafast differential-transmission spectroscopy of excitons in strained ZnSe layers and Zn1-xCdxSe/ZnSe quantum wells
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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 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.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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