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.
Original language | English |
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Pages (from-to) | 3537-3544 |
Number of pages | 8 |
Journal | ACS Nano |
Volume | 6 |
Issue number | 4 |
DOIs | |
Publication status | Published - 24 Apr 2012 |
Keywords
- broad-band
- conformal transformation
- nanoantenna
- plasmonic
- third harmonic generation
ASJC Scopus subject areas
- General Engineering
- General Materials Science
- General Physics and Astronomy