Multimode hybrid gold-silicon nanoantennas for tailored nanoscale optical confinement

High-index dielectric nanoantennas, which provide an interplay between electric and magnetic modes, have been widely used as building blocks for a variety of devices and metasurfaces, both in linear and nonlinear regimes. Here, we investigate hybrid metal-semiconductor nanoantennas, consisting of a...

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Bibliographic Details
Published in:Nanophotonics (Berlin, Germany) Germany), 2023-07, Vol.12 (14), p.2997-3005
Main Authors: McPolin, Cillian P. T., Vila, Yago N., Krasavin, Alexey V., Llorca, Jordi, Zayats, Anatoly V.
Format: Article
Language:English
Subjects:
Cathodoluminescence
Confinement
Electron beams
Gold
Hot electrons
hybrid nanoantennas
Light emission
Magnetic resonance
Mie resonances
Modal choice
Nanoantennas
plasmonic nanostructures
Silicon
silicon nanopillars
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Summary:High-index dielectric nanoantennas, which provide an interplay between electric and magnetic modes, have been widely used as building blocks for a variety of devices and metasurfaces, both in linear and nonlinear regimes. Here, we investigate hybrid metal-semiconductor nanoantennas, consisting of a multimode silicon nanopillar core coated with a gold layer, that offer an enhanced degree of control over the mode selection and confinement, and emission of light on the nanoscale exploiting high-order electric and magnetic resonances. Cathodoluminescence spectra revealed a multitude of resonant modes supported by the nanoantennas due to hybridization of the Mie resonances of the core and the plasmonic resonances of the shell. Eigenmode analysis revealed the modes that exhibit enhanced field localization at the gold interface, together with high confinement within the nanopillar volume. Consequently, this architecture provides a flexible means of engineering nanoscale components with tailored optical modes and field confinement for a plethora of applications, including sensing, hot-electron photodetection and nanophotonics with cylindrical vector beams.
ISSN:2192-8606
2192-8614
DOI:10.1515/nanoph-2023-0105