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Efficient Third Harmonic Generation from Metal–Dielectric Hybrid Nanoantennas
journal contribution
posted on 2017-03-13, 00:00 authored by Toshihiko Shibanuma, Gustavo Grinblat, Pablo Albella, Stefan A. MaierHigh
refractive index dielectric nanoantennas are expected to become key
elements for nonlinear nano-optics applications due to their large
nonlinearities, low energy losses, and ability to produce high electric
field enhancements in relatively large nanoscale volumes. In this
work, we show that the nonlinear response from a high-index dielectric
nanoantenna can be significantly improved by adding a metallic component
to build a metal–dielectric hybrid nanostructure. We demonstrate
that the plasmonic resonance of a Au nanoring can boost the anapole
mode supported by a Si nanodisk, strongly enhancing the electric field
inside the large third-order susceptibility dielectric. As a result,
a high third harmonic conversion efficiency, which reaches 0.007%
at a third harmonic wavelength of 440 nm, is obtained. In addition,
by suitably modifying geometrical parameters of the hybrid nanoantenna,
we tune the enhanced third harmonic emission throughout the optical
regime. Coupling metallic and dielectric nanoantennas to expand the
potential of subwavelength structures opens new paths for efficient
nonlinear optical effects in the visible range on the nanoscale.
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Keywords
index dielectric nanoantennashigh-index dielectric nanoantennaSi nanodiskanapole modefield enhancementssubwavelength structuresnonlinear response440 nmenergy lossesthird-order susceptibility dielectricconversion efficiencyEfficient Third Harmonic Generationnanoscale volumesdielectric nanoantennasnonlinear nano-optics applicationsplasmonic resonance
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