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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 22, Iss. 10 — May. 15, 1997
  • pp: 715–717

Ultrafast field dynamics in large-aperture photoconductors

A. J. Taylor, G. Rodriguez, and D. Some  »View Author Affiliations


Optics Letters, Vol. 22, Issue 10, pp. 715-717 (1997)
http://dx.doi.org/10.1364/OL.22.000715


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Abstract

We investigated field screening mechanisms in large-aperture GaAs photoconductors, using an ultrafast pump–probe terahertz technique. After photoexcitation the bias field decreases to an intensity-dependent value as a result of near-field screening of the bias field. For longer delays the field exhibits an intensity-dependent decrease that results from a space-charge field caused by transport-induced charge separation. These measurements support recent theoretical results that the dominant saturation mechanism that limits terahertz output from large-aperture photoconductors is near-field screening of the bias field because the space-charge field develops on a much longer time scale than that of the terahertz pulse.

© 1997 Optical Society of America

Citation
A. J. Taylor, G. Rodriguez, and D. Some, "Ultrafast field dynamics in large-aperture photoconductors," Opt. Lett. 22, 715-717 (1997)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-22-10-715

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