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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 36, Iss. 13 — Jul. 1, 2011
  • pp: 2572–2574

Percolation-enhanced generation of terahertz pulses by optical rectification on ultrathin gold films

Gopakumar Ramakrishnan and Paul C. M. Planken  »View Author Affiliations


Optics Letters, Vol. 36, Issue 13, pp. 2572-2574 (2011)
http://dx.doi.org/10.1364/OL.36.002572


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Abstract

Emission of pulses of electromagnetic radiation in the terahertz range is observed when ultrathin gold films on glass are illuminated with femtosecond near-IR laser pulses. A distinct maximum is observed in the emitted terahertz amplitude from films of average thickness just above the percolation threshold. Our measurements suggest that the emission is through a second-order nonlinear optical rectification process, enhanced by the excitation of localized surface plasmon hot spots on the percolated metal film.

© 2011 Optical Society of America

OCIS Codes
(240.4350) Optics at surfaces : Nonlinear optics at surfaces
(240.6680) Optics at surfaces : Surface plasmons
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Optics at Surfaces

History
Original Manuscript: May 10, 2011
Revised Manuscript: June 2, 2011
Manuscript Accepted: June 10, 2011
Published: July 1, 2011

Citation
Gopakumar Ramakrishnan and Paul C. M. Planken, "Percolation-enhanced generation of terahertz pulses by optical rectification on ultrathin gold films," Opt. Lett. 36, 2572-2574 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-13-2572


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