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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 37, Iss. 19 — Oct. 1, 2012
  • pp: 4053–4055

Terahertz emission from surface-immobilized gold nanospheres

Kotaro Kajikawa, Yusuke Nagai, Yuichi Uchiho, Gopakumar Ramakrishnan, Nishant Kumar, Gopika K. P. Ramanandan, and Paul C. M. Planken  »View Author Affiliations


Optics Letters, Vol. 37, Issue 19, pp. 4053-4055 (2012)
http://dx.doi.org/10.1364/OL.37.004053


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Abstract

Electromagnetic wave emission based on optical rectification at terahertz (THz) wavelengths was observed from surface-immobilized gold nanospheres (SIGNs) above a gold surface. Although the excitation wavelength is off-resonant with the localized surface plasmons, the THz emission field was observed to be approximately 4.8 times greater than that from a percolated gold thin film of 10 nm thickness. A theoretical calculation predicts that the light electric field is enhanced in the SIGN system, even at off-resonance wavelengths. The observed THz field amplitude was quadratic with the illumination light field, suggesting that the THz generation is due to a second-order nonlinear optical process.

© 2012 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:
Spectroscopy

History
Original Manuscript: July 20, 2012
Revised Manuscript: August 15, 2012
Manuscript Accepted: August 19, 2012
Published: September 24, 2012

Citation
Kotaro Kajikawa, Yusuke Nagai, Yuichi Uchiho, Gopakumar Ramakrishnan, Nishant Kumar, Gopika K. P. Ramanandan, and Paul C. M. Planken, "Terahertz emission from surface-immobilized gold nanospheres," Opt. Lett. 37, 4053-4055 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-19-4053


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