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Second-Harmonic Generation from Metal Nanoparticles: Resonance Enhancement versus Particle Geometry

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Pages (from-to)530-534
Number of pages5
JournalNano Letters
Volume15
Issue number1
Early online date18 Dec 2014
DOIs
Publication statusPublished - 14 Jan 2015
Publication typeA1 Journal article-refereed

Abstract

We demonstrate that optical second-harmonic generation (SHG) from arrays of noncentrosymmetric gold nanoparticles depends essentially on particle geometry. We prepare nanoparticles with different geometrical shapes (L and T) but similar wavelengths for the polarization-dependent plasmon resonances. In contrast to recent interpretations emphasizing resonances at the fundamental frequency, the T shape leads to stronger SHG when only one, instead of both, polarization component of the fundamental field is resonant. This is explained by the character of plasmon oscillations supported by the two shapes. Our numerical simulations for both linear and second-order responses display unprecedented agreement with measurements.

Keywords

  • Metal nanoparticles, nonlinear optics, plasmonic resonances, second-harmonic generation

Publication forum classification

Field of science, Statistics Finland