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Proceedings Paper

Optical generation of terahertz pulses in quantum wells
Author(s): Paul C.M. Planken; Martin C. Nuss; Igal Brener; Keith W. Goossen; Marie S. C. Luo; Shun-Lien Chuang
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Paper Abstract

We report on the generation of terahertz pulses from the optical excitation of excitons in GaAs/Al0.3Ga0.7As quantum wells. In general there are two contributions to the THz signals for nonzero field. The first arises from the creation of excitons in states in which they are already polarized. This leads to a time-dependent polarization that grows with the integrated pulse energy and radiates a short electrical transient. The second one arises from the coherent excitation of both light hole and heavy hole excitons. The time evolution of the coherent superposition of these two exciton states give rise to charge oscillations that radiate a terahertz signal consisting of several oscillations of the electric field. By applying a field to the sample we can tune the oscillation frequency from 1.4 to 2.6 THz.

Paper Details

Date Published: 17 June 1993
PDF: 8 pages
Proc. SPIE 1861, Ultrafast Pulse Generation and Spectroscopy, (17 June 1993); doi: 10.1117/12.147054
Show Author Affiliations
Paul C.M. Planken, AT&T Bell Labs. (United States)
Martin C. Nuss, AT&T Bell Labs. (United States)
Igal Brener, AT&T Bell Labs. (United States)
Keith W. Goossen, AT&T Bell Labs. (United States)
Marie S. C. Luo, Univ. of Illinois/Urbana-Champaign (United States)
Shun-Lien Chuang, Univ. of Illinois/Urbana-Champaign (United States)

Published in SPIE Proceedings Vol. 1861:
Ultrafast Pulse Generation and Spectroscopy
Timothy R. Gosnell; Antoinette J. Taylor; Keith A. Nelson; Michael C. Downer, Editor(s)

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