Daniele Sanvitto

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Three dimensional helical chiral metamaterials resulted in effective manipulation of circularly polarized light in the visible infrared for advanced nanophotonics. Their potentialities are severely limited by the lack of full rotational symmetry preventing broadband operation, high signal-to-noise ratio and inducing high optical activity sensitivity to(More)
We report observation of oscillations in the dynamics of a microcavity polariton condensate formed under pulsed nonresonant excitation. While oscillations in a condensate have always been attributed to Josephson mechanisms due to a chemical potential unbalance, here we show that under some localization conditions of the condensate, they may arise from(More)
In this paper, we report on the effect of metal oxidation on strong coupling interactions between silver nanostructures and a J-aggregated cyanine dye. We show that metal oxidation can sensibly affect the plexcitonic system, inducing a change in the coupling strength. In particular, we demonstrate that the presence of oxide prevents the appearance of Rabi(More)
We report theoretical evidence that bulk nonlinear materials weakly interacting with highly localized plasmonic modes in ultra-sub-wavelength metallic nanostructures can lead to nonlinear effects at the single plasmon level in the visible range. In particular, the two-plasmon interaction energy in such systems is numerically estimated to be comparable with(More)
We report a record-size, two-dimensional polariton condensate of a fraction of a millimeter radius free from the presence of an exciton reservoir. This macroscopically occupied state is formed by the ballistically expanding polariton flow that relaxes and condenses over a large area outside of the excitation spot. The density of this trap-free condensate is(More)
We report on a theoretical investigation of guided polariton states arising from the strong coupling between a single quantum-well exciton and a Bloch Surface Wave in a multi-layered structure. We show that the polariton Rabi splitting can be increased by almost 40% as compared to that achievable in a similar structure made in a conventional planar(More)
The Hanbury Brown-Twiss effect is one of the celebrated phenomenologies of modern physics that accommodates equally well classical (interferences of waves) and quantum (correlations between indistinguishable particles) interpretations. The effect was discovered in the late thirties with a basic observation of Hanbury Brown that radio-pulses from two(More)
Consiglio Nazionale delle Ricerche (CNR) NANOTEC, Istituto di Nanotecnologia, Via Monteroni, 73100 Lecce, Italy. Università del Salento, Dipartimento di Matematica e Fisica ‘‘Ennio de Giorgi,’’ Via Arnesano, 73100 Lecce, Italy. Department of Physics, University of Warwick, CV47AL Coventry, UK. Departamento de Física Teórica de la Materia Condensada,(More)