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Proceedings Paper

Electro-Optical And Nonlinear Optical Characterization Of Narrow-Gap Superlattices
Author(s): C. A. Hoffman; J. R. Meyer; E. R. Youngdale; J. R. Lindle; F. J. Bartoli; J. W. Han; J. W. Cook Jr.; J. F. Schetzina; X. Chu; J. P. Faurie
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Paper Abstract

Magneto-transport and photo-transport measurements on MBE-grown HgTe/CdTe and HgZnTe/CdTe superlattices have been made. A detailed analysis of the magnetic-field-dependent Hall data shows that mixed conduction by more than one carrier species is significant at all temperatures. The T-dependence of the intrinsic carrier density has been used to characterize the bandgap and the product of the electron and hole density-of-states effective masses. Hole mobilities greater than 105 cm2/Vs are reported. Photo-Hall measurements employing CO2 laser-irradiation to generate excess electrons and holes are shown to yield minority electron mobilities and free-carrier lifetimes. Theoretical band-structure calculations by the tight-binding method are consistent with the experimental results in that they predict not only zero bandgap but also electron and hole effective masses which are both considerably less than O.Olmo. Calculated superlattice band structures are found to display a number of features which suggest the potential for large optical nonlinearities. Experimentally third-order nonlinear susceptibilities have been determined by the non-degenerate four-wave mixing technique, using a pair of grating tuned, Q-switched CO2 lasers. Even though the samples were grown without regard to optimizing the nonlinear optical properties, a x(3) of nearly 10-4 esu was observed in the non-degenerate four-wave mixing configuration.

Paper Details

Date Published: 3 May 1988
PDF: 8 pages
Proc. SPIE 0878, Multifunctional Materials, (3 May 1988); doi: 10.1117/12.943955
Show Author Affiliations
C. A. Hoffman, Naval Research Laboratory (United States)
J. R. Meyer, Naval Research Laboratory (United States)
E. R. Youngdale, Naval Research Laboratory (United States)
J. R. Lindle, Naval Research Laboratory (United States)
F. J. Bartoli, Naval Research Laboratory (United States)
J. W. Han, North Carolina State University (United States)
J. W. Cook Jr., North Carolina State University (United States)
J. F. Schetzina, North Carolina State University (United States)
X. Chu, University of Illinois at Chicago (United States)
J. P. Faurie, University of Illinois at Chicago (United States)

Published in SPIE Proceedings Vol. 0878:
Multifunctional Materials
Robert L. Gunshor, Editor(s)

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