Title

Spectral and temperature dependence of two-photon and free-carrier absorption in InSb

Authors

Authors

P. D. Olszak; C. M. Cirloganu; S. Webster; L. A. Padilha; S. Guha; L. P. Gonzalez; S. Krishnamurthy; D. J. Hagan;E. W. Van Stryland

Comments

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Abbreviated Journal Title

Phys. Rev. B

Keywords

ZINC BLENDE SEMICONDUCTORS; NONLINEAR REFRACTION; ZINCBLENDE; SEMICONDUCTORS; SINGLE-BEAM; SOLIDS; GAP; COEFFICIENTS; DISPERSION; Physics, Condensed Matter

Abstract

The nonlinear absorption spectrum of InSb was measured using a combination of tunable similar to 160 fs, similar to 10 ps, and similar to 150 ns IR sources along with a cryostat for controlling the sample temperature to vary the band gap energy from 0.17 to 0.23 eV. The measured nonlinear optical properties in InSb are consistent with those predicted by the models which include two-and three-photon absorption (2PA and 3PA), multiphoton generated free-carrier absorption (FCA) and various recombination mechanisms. Temperature-dependent Z-scan and nonlinear transmission measurements yield information on the temperature and spectral dependence of 2PA, FCA, and carrier recombination processes of Shockley-Read-Hall, and Auger mechanisms. We find good agreement between the measured and the modeled nonlinear properties is possible only when the recently predicted temperature dependence of the FCA is considered. The wavelength-and temperature-dependent 2PA and 3PA coefficients in InSb were experimentally obtained. The inferred values of the 2PA and 3PA are consistent with the scaling rules of a simple two-parabolic band model. We further determine recombination rates from nonlinear transmittance of nanosecond pulses of CO2 laser.

Journal Title

Physical Review B

Volume

82

Issue/Number

23

Publication Date

1-1-2010

Document Type

Article

Language

English

First Page

10

WOS Identifier

WOS:000286768800005

ISSN

1098-0121

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