17 August 2014 Observation of quantum interference in the plasmonic Hong-Ou-Mandel effect (presentation video)
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In this presentation, we report direct evidence of the bosonic nature of SPPs in a scattering-based beamsplitter, in one of the most simple experiments of quantum optics - done using SPPs instead of photons propagating in air. A parametric down-conversion source is used to produce two indistinguishable photons, each of which is converted into a SPP on a metal-stripe waveguide and then made to interact through a semi-transparent Bragg mirror. In this plasmonic analog of the Hong-Ou-Mandel experiment, we measure a coincidence dip with a visibility of 72%, the signature that SPPs are bosons and that quantum interference is clearly involved.
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Yannick Sonnefraud, Yannick Sonnefraud, Giuliana Di Martino, Giuliana Di Martino, Mark S Tame, Mark S Tame, Stéphane Kéna-Cohen, Stéphane Kéna-Cohen, Frederik Dieleman, Frederik Dieleman, Sahin K. Ozdemir, Sahin K. Ozdemir, Myungshik Kim, Myungshik Kim, Stefan A. Maier, Stefan A. Maier, "Observation of quantum interference in the plasmonic Hong-Ou-Mandel effect (presentation video)", Proc. SPIE 9163, Plasmonics: Metallic Nanostructures and Their Optical Properties XII, 916322 (17 August 2014); doi: 10.1117/12.2061003; https://doi.org/10.1117/12.2061003

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