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arXiv · 1504.02201

Directional out-coupling of light from a plasmonic nanowire-nanoparticle junction

Danveer Singh·Arindam Dasgupta·Aswathy V. G.·Ravi Tripathi·G. V. Pavan Kumar
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Abstract

We experimentally show how a single Ag nanoparticle (NP) coupled to an Ag nanowire (NW) can convert propagating surface plasmon polaritons to directional photons. By employing dual-excitation Fourier microscopy with spatially filtered collection-optics, we show single- and dual-directional out-coupling of light from NW-NP junction for plasmons excited through glass-substrate and air-superstrate. Furthermore, we show NW-NP junction can influence the directionality of molecular-fluorescence emission, thus functioning as an optical antenna. The results discussed herein may have implications in realizing directional single-photon sources and quantum plasmon circuitry.

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Danveer Singh, Arindam Dasgupta, Aswathy V. G., Ravi Tripathi, G. V. Pavan Kumar. 2015-04-09. Directional out-coupling of light from a plasmonic nanowire-nanoparticle junction. https://doi.org/10.1364/ol.40.001006

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