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Terahertz emission from surface-immobilized gold nanospheres |
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 10Â 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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