Details
| Original language | English |
|---|---|
| Pages (from-to) | 1575-1580 |
| Number of pages | 6 |
| Journal | Optical materials express |
| Volume | 7 |
| Issue number | 5 |
| Publication status | Published - 11 Apr 2017 |
| Externally published | Yes |
Abstract
Plasmonic nanoantennas have been recently proposed to boost nonlinear optical processes. In a metal dipole nanoantenna with a dielectric nanoparticle placed in the gap, the linear field enhancement can be exploited to enhance third harmonic emission. Since both metals and dielectrics exhibit nonlinearity, the nonlinear far-field contains contributions from each, and the diffculty of measuring these contributions separately has led to seemingly contradictory interpretations about the origin of the nonlinear emission. We determine that the origin of the third harmonic from metal-dielectric dipole nanoantennas depends on nanoantenna design, and in particular, the width. We find that the emission from gold dominates in thin threadlike nanoantennas, whereas the emission from the gap material dominates in wider nanoantennas. We also find that the nonlinear emission from gold in dipole nanoantennas is lower than monopoles of comparable dimensions, but that placing a highly nonlinear material in their gaps makes the nonlinear emission from the gap material dominate over gold.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
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In: Optical materials express, Vol. 7, No. 5, 11.04.2017, p. 1575-1580.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Origin of third harmonic generation in plasmonic nanoantennas
AU - Lesina, Antonino Calà
AU - Berini, Pierre
AU - Ramunno, Lora
PY - 2017/4/11
Y1 - 2017/4/11
N2 - Plasmonic nanoantennas have been recently proposed to boost nonlinear optical processes. In a metal dipole nanoantenna with a dielectric nanoparticle placed in the gap, the linear field enhancement can be exploited to enhance third harmonic emission. Since both metals and dielectrics exhibit nonlinearity, the nonlinear far-field contains contributions from each, and the diffculty of measuring these contributions separately has led to seemingly contradictory interpretations about the origin of the nonlinear emission. We determine that the origin of the third harmonic from metal-dielectric dipole nanoantennas depends on nanoantenna design, and in particular, the width. We find that the emission from gold dominates in thin threadlike nanoantennas, whereas the emission from the gap material dominates in wider nanoantennas. We also find that the nonlinear emission from gold in dipole nanoantennas is lower than monopoles of comparable dimensions, but that placing a highly nonlinear material in their gaps makes the nonlinear emission from the gap material dominate over gold.
AB - Plasmonic nanoantennas have been recently proposed to boost nonlinear optical processes. In a metal dipole nanoantenna with a dielectric nanoparticle placed in the gap, the linear field enhancement can be exploited to enhance third harmonic emission. Since both metals and dielectrics exhibit nonlinearity, the nonlinear far-field contains contributions from each, and the diffculty of measuring these contributions separately has led to seemingly contradictory interpretations about the origin of the nonlinear emission. We determine that the origin of the third harmonic from metal-dielectric dipole nanoantennas depends on nanoantenna design, and in particular, the width. We find that the emission from gold dominates in thin threadlike nanoantennas, whereas the emission from the gap material dominates in wider nanoantennas. We also find that the nonlinear emission from gold in dipole nanoantennas is lower than monopoles of comparable dimensions, but that placing a highly nonlinear material in their gaps makes the nonlinear emission from the gap material dominate over gold.
UR - http://www.scopus.com/inward/record.url?scp=85017445194&partnerID=8YFLogxK
U2 - 10.1364/OME.7.001575
DO - 10.1364/OME.7.001575
M3 - Article
AN - SCOPUS:85017445194
VL - 7
SP - 1575
EP - 1580
JO - Optical materials express
JF - Optical materials express
SN - 2159-3930
IS - 5
ER -