ELECTRON-HOLE PLASMA GRATINGS RELATED TO THE URBACH TAIL IN POLAR SEMICONDUCTORS
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Published:1996-10
Issue:04
Volume:05
Page:631-636
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ISSN:0218-8635
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Container-title:Journal of Nonlinear Optical Physics & Materials
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language:en
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Short-container-title:J. Nonlinear Optic. Phys. Mat.
Author:
GRAC R.1,
IEHL J.L.1,
PUGNET M.1
Affiliation:
1. L.A.A.S.-C.N.R.S., 7, Avenue du Colonel Roche, 31077 Toulouse Cedex, France
Abstract
We have studied the optical index modulation in the Urbach tail of Cd 0.96 Zn 0.04 Te , using the transient grating technique in the subnanosecond domain. We have shown that the screening of the electric field due to LO-phonons by free carriers can explain the main features of picosecond transient grating experiments in the spectral region of the Urbach tail in CdZnTe. We can explain simultaneously the following features: the existence of a break in the kinetics, the saturation of the diffraction efficiency with the pump energy, the possibility of grating erasure and finally the order of magnitude of the experimental diffraction efficiency.
Publisher
World Scientific Pub Co Pte Lt
Subject
Physics and Astronomy (miscellaneous),Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials