Optical Gunn effect in n-doped GaAs at mid- and far-IR wavelengths

Johan H. Stiens; Gennady N. Shkerdin; Filip Marest; Roger A. Vounckx

doi:10.1117/12.369398

9 November 1999 Optical Gunn effect in n-doped GaAs at mid- and far-IR wavelengths

Johan H. Stiens, Gennady N. Shkerdin, Filip Marest, Roger A. Vounckx

Proceedings Volume 3899, Photonics Technology into the 21st Century: Semiconductors, Microstructures, and Nanostructures; (1999) https://doi.org/10.1117/12.369398
Event: International Symposium on Photonics and Applications, 1999, Singapore, Singapore

Abstract

In this paper a rigorous quantum mechanical multi-valley model is developed to assess the optical equivalent of the electrical Gunn effect: a laser beam pumps free electrons from the central conduction band valley of n-doped bulk GaAs towards its satellite values. The computational complexities involve a central fully nonparabolic degenerated (Gamma) - valley, an anisotropic L-valley of arbitrary degeneracy, impurity assisted, thermal and hot polar optical phonon assisted intravalley absorption mechanisms, and intervalley phonon assisted equivalent and nonequivalent intervalley absorption mechanisms. The influences of the doping concentrations, electron temperature, optical power density and the equivalent LL-intervalley deformation potential (IDP) on the magnitude and relaxation time of the optical Gunn effect are discussed and compared with experimental results. We found that the optically induced nonlinear absorption and intervalley transfer strongly depend on the equivalent LL-IDP. The large scattering on the available data for LL-IDP leads to large variations in the theoretical estimations. Under optical plasma resonance conditions we find an energy relaxation time in the L-valley of about 0.3 to 2.2 ps, a nonlinear refractive index n₂ of about 2.7 to 3.75 X 10^-81 cm²/W and e.g. a 10 percent electron transfer of about 1.8 to 3.2 MWcm^-2.

Citation Download Citation

Johan H. Stiens, Gennady N. Shkerdin, Filip Marest, and Roger A. Vounckx "Optical Gunn effect in n-doped GaAs at mid- and far-IR wavelengths", Proc. SPIE 3899, Photonics Technology into the 21st Century: Semiconductors, Microstructures, and Nanostructures, (9 November 1999); https://doi.org/10.1117/12.369398

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KEYWORDS

Electrons

Absorption

Phonons

Gallium arsenide

Doping

Infrared radiation

Dielectrics

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