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

Miguel Navarro-Cia, Stefan A. Maier

Research output: Contribution to journalArticleResearchpeer-review

106 Citations (Scopus)


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 languageEnglish
Pages (from-to)3537-3544
Number of pages8
JournalACS Nano
Issue number4
Publication statusPublished - 24 Apr 2012
Externally publishedYes


  • broad-band
  • conformal transformation
  • nanoantenna
  • plasmonic
  • third harmonic generation

Cite this