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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 30, Iss. 18 — Sep. 15, 2005
  • pp: 2490–2492

Efficient photoconductive terahertz source using line excitation

Joong H. Kim, Arup Polley, and Stephen E. Ralph  »View Author Affiliations


Optics Letters, Vol. 30, Issue 18, pp. 2490-2492 (2005)
http://dx.doi.org/10.1364/OL.30.002490


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Abstract

We report significant improvement in terahertz (THz) power and efficiency using photoconductive sources by use of a spatially extended line source excitation and the trap enhanced field effect that occurs in sources made on semi-insulating GaAs. The combination of high electric fields and reduced screening effects allows 10 µW of THz power to be generated with 14 mW of absorbed optical power, demonstrating nearly 0.1% optical-to-THz conversion efficiency.

© 2005 Optical Society of America

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

Citation
Joong H. Kim, Arup Polley, and Stephen E. Ralph, "Efficient photoconductive terahertz source using line excitation," Opt. Lett. 30, 2490-2492 (2005)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-30-18-2490

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