ph9b01515_si_003.avi (182.48 kB)
Steering of Guided Light with Dielectric Nanoantennas
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posted on 2020-02-14, 15:13 authored by Ivan Sinev, Filipp Komissarenko, Ivan Iorsh, Dmitry Permyakov, Anton Samusev, Andrey BogdanovAll-dielectric nanoantennas
proved to be an extremely versatile
tool for efficient light manipulation at the nanoscale. Their rich
functionality and excellent performance arise due to low absorption
and high refractive index of all-dielectric materials, in particular,
silicon, which enables the observation of pronounced magnetic and
electric Mie resonances in subwavelength structures in the visible
and near-infrared ranges. Here, we demonstrate that all-dielectric
spherical nanoantennas placed on a substrate supporting guided modes
provide efficient control over their directivity pattern, achieved
due to the interplay between polarization of the incident light and
the interference of electric and magnetic dipole resonances of the
nanoantenna. In particular, by managing only the wavelength and polarization
state of the incident plane wave at a fixed direction of incidence,
it is possible to implement highly directional full-angle steering
of surface plasmon polariton on a gold film. As a proof of concept,
we experimentally demonstrate plasmonic beam steering with a single
silicon nanoantenna using circular polarization of light. Our approach
offers unprecedented versatility for designing nanoscale antennas
with applications in integrated nanophotonics and quantum optics.
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quantum opticssurface plasmon polaritonDielectric Nanoantennas All-dielectric nanoantennasincident lightgold filmplasmonic beam steeringGuided Lightfull-angle steeringlight manipulationdirectivity patternnear-infrared rangesnanoscale antennasincident plane waveall-dielectric materialspolarization statesilicon nanoantennaMie resonancessubwavelength structures
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