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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.
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
Consultar en UCrea Leer publicación
SHIBANUMA, TOSHIHIKO
GRINBLAT, GUSTAVO
PABLO ALBELLA ECHAVE
MAIER, STEFAN A.
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