Second-Harmonic Generation from Metal Nanoparticles: Resonance Enhancement versus Particle Geometry
Research output: Contribution to journal › Article › Scientific › peer-review
Details
| Original language | English |
|---|---|
| Pages (from-to) | 530-534 |
| Number of pages | 5 |
| Journal | Nano Letters |
| Volume | 15 |
| Issue number | 1 |
| Early online date | 18 Dec 2014 |
| DOIs | |
| Publication status | Published - 14 Jan 2015 |
| Publication type | A1 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.
ASJC Scopus subject areas
Keywords
- Metal nanoparticles, nonlinear optics, plasmonic resonances, second-harmonic generation