Quantum Spectroscopy of Plasmonic Nanostructures

Quantum Spectroscopy of Plasmonic Nanostructures
Title:
Quantum Spectroscopy of Plasmonic Nanostructures
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PHYSICAL REVIEW X
Keywords:
Publication Date:
25 March 2014
Citation:
Phys. Rev. X 4, 011049 (2014)
Abstract:
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 biosamples and chemical substances.
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PublisherCopyrights
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ISSN:
2160-3308
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