Unidirectional Side Scattering of Light by a Single-Element Nanoantenna

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-shap...

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Veröffentlicht in:	Nano letters 2013-08, Vol.13 (8), p.3843-3849
Hauptverfasser:	Vercruysse, Dries, Sonnefraud, Yannick, Verellen, Niels, Fuchs, Fabian B, Di Martino, Giuliana, Lagae, Liesbet, Moshchalkov, Victor V, Maier, Stefan A, Van Dorpe, Pol
Format:	Artikel
Sprache:	eng
Schlagworte:	Antennas Applied sciences Collective excitations (including excitons, polarons, plasmons and other charge-density excitations) Computer simulation Condensed matter: electronic structure, electrical, magnetic, and optical properties Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science rheology Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures Electronics Exact sciences and technology Fluorescence Focal plane Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties Materials science Molecular electronics, nanoelectronics Nanocrystalline materials Nanoscale materials and structures: fabrication and characterization Nanostructure Noise levels Physics Raman scattering Scattering Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices Surface and interface electron states Surfaces and interfaces thin films and whiskers (structure and nonelectronic properties)
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Zusammenfassung:	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.
ISSN:	1530-6984 1530-6992
DOI:	10.1021/nl401877w