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

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-coupl...

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Bibliographic Details
Published in:Optics letters 2015-03, Vol.40 (6), p.1006-1009
Main Authors: Singh, Danveer, Dasgupta, Arindam, Aswathy, V G, Tripathi, Ravi P N, Pavan Kumar, G V
Format: Article
Language:English
Subjects:
Antennas
Fourier analysis
Microscopy
Nanostructure
Nanowires
Plasmonics
Plasmons
Silver
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Summary: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.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.40.001006