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Frederik Dieleman

EXSS Imperial College, London

Friday, September 23rd, 2016 at 03:00:00 PM

Biblioteca LENS

Published on-line at 09:18:41 AM on Monday, September 19th, 2016

Quantum interference and tomography with Surface Plasmon Polaritons

On Friday, September 23rd, 2016 at 3.00 PM

Surface Plasmon Polaritons are the result of the coupling of photons with plasmons, the quantum of the plasma oscillation of the free electrons in for example metals. The quantum properties of this coupled entity between photons and electrons have recently been studied on the single quantum level in nanophotonic structures like plasmonic cavities and waveguides. The high confinement of optical modes in plasmonics bears the promise of strongly improved light-matter interactions, spurring a wide range of theoretical and experimental research in quantum plasmonics.[3]  I will talk about first direct evidence of the bosonic nature of SPPs. We measured a two-SPP interference [1], the plasmonic version of the Hong-Ou-Mandel experiment [2], in a scattering based plasmonic beam splitter. A non-classical visibility of the interference of 72 % was obtained. Furthermore, preliminary results of quantum tomography work on the plasmonic two-photon interference will be discussed. A tomography set-up is used to reconstruct the full density matrix of the optical output, allowing to quantify the entanglement generated in the interference, to our knowledge for the first time in a plasmonic structure.

For further informations, please contact Costanza Toninelli.