title: Unidirectional side scattering of light by a single-element nanoantenna.
abstract: Unidirectional side scattering of light by a single-element plasmonic nanoantenna is demonstrated using full-field simulations and back focal plane measurements. We show that the phase and amplitude matching that occurs at the Fano interference between two localized surface plasmon modes in a V-shaped nanoparticle lies at the origin of this effect. A detailed analysis of the V-antenna modeled as a system of two coherent point-dipole sources elucidates the mechanisms that give rise to a tunable experimental directivity as large as 15 dB. The understanding of Fano-based directional scattering opens a way to develop new directional optical antennas for subwavelength color routing and self-referenced directional sensing. In addition, the directionality of these nanoantennas can increase the detection efficiency of fluorescence and surface enhanced Raman scattering.
authors.affiliation: IMEC, Kapeldreef 75, B-3001 Leuven, Belgium. Dries.Vercruysse@imec.be
authors.forename: Dries
authors.initials: D
authors.lastname: Vercruysse
authors.forename: Yannick
authors.initials: Y
authors.lastname: Sonnefraud
authors.forename: Niels
authors.initials: N
authors.lastname: Verellen
authors.forename: Fabian B
authors.initials: FB
authors.lastname: Fuchs
authors.forename: Giuliana
authors.initials: G
authors.lastname: Di Martino
authors.forename: Liesbet
authors.initials: L
authors.lastname: Lagae
authors.forename: Victor V
authors.initials: VV
authors.lastname: Moshchalkov
authors.forename: Stefan A
authors.initials: SA
authors.lastname: Maier
authors.forename: Pol
authors.initials: P
authors.lastname: Van Dorpe