Quantum Spectroscopy of Plasmonic Nanostructures
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.
- Publication:
-
Physical Review X
- Pub Date:
- January 2014
- DOI:
- 10.1103/PhysRevX.4.011049
- arXiv:
- arXiv:1312.3105
- Bibcode:
- 2014PhRvX...4a1049K
- Keywords:
-
- 42.50.-p;
- 42.79.Pw;
- 78.67.Bf;
- 62.23.Pq;
- Quantum optics;
- Imaging detectors and sensors;
- Nanocrystals and nanoparticles;
- Composites;
- Quantum Physics;
- Physics - Optics
- E-Print:
- 11 pages, 5 figures