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Broad-band near-infrared plasmonic nanoantennas for higher harmonic generation.

Navarro-Cia, M; Maier, SA; (2012) Broad-band near-infrared plasmonic nanoantennas for higher harmonic generation. ACS Nano , 6 (4) pp. 3537-3544. 10.1021/nn300565x.

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Abstract

We propose a broad-band near-infrared trapezoidal plasmonic nanoantenna, analyze it numerically using finite integration and difference time domain techniques, and explain qualitatively its performance via a multidipolar scenario as well as a conformal transformation. The plasmonic nanoantenna reported here intercepts the incoming light as if it were of cross-sectional area larger than double its actual physical size for a 1500 nm bandwidth expanding from the near-infrared to the visible spectrum. Within this bandwidth, it also confines the incoming light to its center with more than 1 order of magnitude field enhancement. This wide-band operation is achieved due to the overlapping of the different dipole resonances excited across the nanoantenna. We further demonstrate that the broad-band field enhancement leads to efficient third harmonic generation in a simplified wire trapezoidal geometry when a Kerr medium is introduced, due to the lightning rod effect at the fundamental and the Purcell effect at the induced third harmonic.

Type: Article
Title: Broad-band near-infrared plasmonic nanoantennas for higher harmonic generation.
Location: United States
DOI: 10.1021/nn300565x
Keywords: Absorption, Infrared Rays, Nanotechnology
UCL classification: UCL > School of BEAMS > Faculty of Engineering Science
UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering
URI: http://discovery.ucl.ac.uk/id/eprint/1360177
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