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23 April 2024 |
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Multimode directionality in all-dielectric metasurfaces | | Yuanqing Yang
; Andrey E. Miroshnichenko
; Sarah V. Kostinski
; Mikhail Odit
; Polina Kapitanova
; Min Qiu
; Yuri Kivshar
; | | Date: |
7 Sep 2016 | | Abstract: | All-dielectric resonant nanophotonics has emerged recently as a new direction
of research aiming at the manipulation of strong optically-induced electric and
magnetic Mie resonances in dielectric nanoparticles with high refractive index,
for a design of metadevices with reduced dissipative losses and large resonant
enhancement of both electric and magnetic fields. Usually, the geometry of
dielectric nanoparticles is considered to be close to either sphere or rod, so
the exact Mie solutions of the scattering problem are applied. Here we study
nanoparticles with a large aspect ratio (such as nanobars) and describe a novel
type of hybrid Mie-Fabry-Perot modes responsible for the existence of multiple
magnetic dipole resonances. The multiple magnetic dipoles originate from a
combination of a magnetic dipolar mode and a number of standing waves of an
elongated anisotropic nanobar. We reveal that these novel hybrid modes can
interfere constructively with the induced electric dipoles and thereby lead to
multimode unidirectional scattering, characterized by multiple Kerker
conditions and multiple unidirectional radiation patterns. Based on these
theoretical results, we demonstrate novel all-dielectric Huygens’ metasurfaces
with multiple unidirectionality property verified in proof-of-principle
microwave experiments. | | Source: | arXiv, 1609.1875 | | Services: | Forum | Review | PDF | Favorites | |
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