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Efficient third harmonic generation from metal-dielectric hybrid nanoantennas

Abstract: High 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.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: Nano Letters, 2017, 17(4), 2647-2651

Editorial: American Chemical Society

 Año de publicación: 2017

Nº de páginas: 5

Tipo de publicación: Artículo de Revista

 DOI: 10.1021/acs.nanolett.7b00462

ISSN: 1530-6984,1530-6992

Url de la publicación: https://doi.org/10.1021/acs.nanolett.7b00462