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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 16 — Jul. 30, 2012
  • pp: 18016–18024

Carrier density dependence of the nonlinear absorption of intense THz radiation in GaAs

G. Sharma, I. Al-Naib, H. Hafez, R. Morandotti, D. G. Cooke, and T. Ozaki  »View Author Affiliations


Optics Express, Vol. 20, Issue 16, pp. 18016-18024 (2012)
http://dx.doi.org/10.1364/OE.20.018016


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Abstract

We study the carrier density dependence of nonlinear terahertz (THz) absorption due to field-induced intervalley scattering in photoexcited GaAs using the optical-pump/THz-probe technique. The intervalley scattering in GaAs is strongly dependent on the photo-carrier density. As the carrier density is increased from 1 × 1017 to 4.7 × 1017 cm−3, the nonlinear absorption bleaching increases. However, if the carrier density is increased further above 4.7 × 1017 cm−3, the trend reverses and the bleaching is reduced. The initial increase in absorption bleaching is because, unlike low THz field, high THz field experiences intervalley scattering and nonparabolicity of the conduction band. On the other hand, a simple electron transport model shows that the reduction in intervalley scattering is mainly due to the increase in the electron-hole scattering rate with the increase in the carrier density. This increase in the electron-hole scattering rate limits the maximum kinetic energy attainable by the electrons and thus reduces the observed nonlinear absorption.

© 2012 OSA

OCIS Codes
(300.6500) Spectroscopy : Spectroscopy, time-resolved
(320.7110) Ultrafast optics : Ultrafast nonlinear optics
(320.7130) Ultrafast optics : Ultrafast processes in condensed matter, including semiconductors
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Ultrafast Optics

History
Original Manuscript: April 27, 2012
Revised Manuscript: July 5, 2012
Manuscript Accepted: July 6, 2012
Published: July 23, 2012

Citation
G. Sharma, I. Al-Naib, H. Hafez, R. Morandotti, D. G. Cooke, and T. Ozaki, "Carrier density dependence of the nonlinear absorption of intense THz radiation in GaAs," Opt. Express 20, 18016-18024 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-16-18016


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