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

Danveer Singh, Arindam Dasgupta, V. G. Aswathy, Ravi P.N. Tripathi, G. V.Pavan Kumar

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


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.

Original languageEnglish
Pages (from-to)1006-1009
Number of pages4
JournalOptics Letters
Issue number6
StatePublished - 15 Mar 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 Optical Society of America.


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