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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Anthony J. Campillo
  • Vol. 32, Iss. 16 — Aug. 15, 2007
  • pp: 2297–2299

Excitation-density-dependent generation of broadband terahertz radiation in an asymmetrically excited photoconductive antenna

Prashanth C. Upadhya, Wenhui Fan, Andrew Burnett, John Cunningham, A. Giles Davies, Edmund H. Linfield, James Lloyd-Hughes, Enrique Castro-Camus, Michael B. Johnston, and Harvey Beere  »View Author Affiliations


Optics Letters, Vol. 32, Issue 16, pp. 2297-2299 (2007)
http://dx.doi.org/10.1364/OL.32.002297


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Abstract

The generation of terahertz (THz) transients in photoconductive emitters has been studied by varying the spatial extent and density of the optically excited photocarriers in asymmetrically excited, biased low-temperature-grown GaAs antenna structures. We find a pronounced dependence of the THz pulse intensity and broadband ( > 6.0 ‚ÄČ THz ) spectral distribution on the pump excitation density and simulate this with a three-dimensional carrier dynamics model. We attribute the observed variation in THz emission to changes in the strength of the screening field.

© 2007 Optical Society of America

OCIS Codes
(260.3090) Physical optics : Infrared, far
(320.7120) Ultrafast optics : Ultrafast phenomena

ToC Category:
Ultrafast Optics

History
Original Manuscript: February 8, 2007
Revised Manuscript: May 25, 2007
Manuscript Accepted: June 22, 2007
Published: August 2, 2007

Citation
Prashanth C. Upadhya, Wenhui Fan, Andrew Burnett, John Cunningham, A. Giles Davies, Edmund H. Linfield, James Lloyd-Hughes, Enrique Castro-Camus, Michael B. Johnston, and Harvey Beere, "Excitation-density-dependent generation of broadband terahertz radiation in an asymmetrically excited photoconductive antenna," Opt. Lett. 32, 2297-2299 (2007)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-32-16-2297

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