Unidirectional scattering by nanoparticles near substrates: generalized Kerker conditions

Starting from a general description of light scattering by a nanoparticle in homogeneous surroundings and situated near a substrate, we outline the connection to multipole expansion of scattered light and derive conditions and limits on achievable half-space scattering asymmetry, including the possi...

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Bibliographic Details
Published in:Optics express 2015-11, Vol.23 (22), p.28808-28828
Main Authors: Pors, Anders, Andersen, Sebastian K H, Bozhevolnyi, Sergey I
Format: Article
Language:English
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Summary:Starting from a general description of light scattering by a nanoparticle in homogeneous surroundings and situated near a substrate, we outline the connection to multipole expansion of scattered light and derive conditions and limits on achievable half-space scattering asymmetry, including the possibility of unidirectional scattering along the propagation direction of the incident light (i.e., generalized Kerker conditions). As a way of realizing strongly asymmetric scattering, we perform a parametric study of the optical properties of disk-shaped gap-surface plasmon (GSP) resonators, consisting of a glass spacer sandwiched between two gold disks, with numerical calculations that corroborate the conditions derived from the multipole expansion. Finally, we present proof-of-principle experiments of asymmetric scattering by GSP-resonators on a glass substrate.
ISSN:1094-4087
1094-4087
DOI:10.1364/oe.23.028808