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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 23 — Nov. 5, 2012
  • pp: 25530–25535

Terahertz photoconductive antenna with metal nanoislands

Sang-Gil Park, Yongje Choi, Young-Jae Oh, and Ki-Hun Jeong  »View Author Affiliations


Optics Express, Vol. 20, Issue 23, pp. 25530-25535 (2012)
http://dx.doi.org/10.1364/OE.20.025530


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Abstract

This work presents a nanoplasmonic photoconductive antenna (PCA) with metal nanoislands for enhancing terahertz (THz) pulse emission. The whole photoconductive area was fully covered with metal nanoislands by using thermal dewetting of thin metal film at relatively low temperature. The metal nanoislands serve as plasmonic nanoantennas to locally enhance the electric field of an ultrashort pulsed pump beam for higher photocarrier generation. The plasmon resonance of metal nanoislands was achieved at an excitation laser wavelength by changing the initial thickness of metal film. This nanoplasmonic PCA shows two times higher enhancement for THz pulse emission power than a conventional PCA. This work opens up a new opportunity for plasmon enhanced large-aperture THz photoconductive antennas.

© 2012 OSA

OCIS Codes
(040.5150) Detectors : Photoconductivity
(250.5403) Optoelectronics : Plasmonics
(310.6628) Thin films : Subwavelength structures, nanostructures
(110.6795) Imaging systems : Terahertz imaging

ToC Category:
Detectors

History
Original Manuscript: August 30, 2012
Revised Manuscript: October 20, 2012
Manuscript Accepted: October 20, 2012
Published: October 25, 2012

Citation
Sang-Gil Park, Yongje Choi, Young-Jae Oh, and Ki-Hun Jeong, "Terahertz photoconductive antenna with metal nanoislands," Opt. Express 20, 25530-25535 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-23-25530


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