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Quantum spectroscopy of plasmonic nanostructures

We use frequency entangled photons, generated via spontaneous parametric down conversion, to measure the broadband spectral response of an array of gold nanoparticles exhibiting Fano-type plasmon resonance. Refractive index sensing of a liquid is performed by measuring the shift of the array resonance. This method is robust in excessively noisy conditions compared with conventional broadband transmission spectroscopy. Detection of a refractive index change is demonstrated with a noise level 70 times higher than the signal, which is shown to be inaccessible with the conventional transmission spectroscopy. Use of low photon fluxes makes this method suitable for measurements of photosensitive bio-samples and chemical substances.

preprint2014arXivOpen access
Dmitry A. KalashnikovZhenying PanArseniy I. KuznetsovLeonid A. Krivitsky
physics.opticsquant-ph
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Dmitry A. KalashnikovZhenying PanArseniy I. KuznetsovLeonid A. Krivitsky

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