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A. Rubano; D. Paparo; F. Miletto; U. Scotti di Uccio; L. Marrucci
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The blue-green photoluminescence emitted by pure and electron-doped strontium titanate under intense pulsed near-ultraviolet excitation is studied experimentally, as a function of excitation intensity and temperature. Both emission spectra and time-resolved decays of the emission are measured and analyzed in the framework of simple phenomenological models. We find an interesting blue-to-green transition occurring for increasing temperatures in pure samples, which is instead absent in doped...
Source: http://arxiv.org/abs/0902.1068v2
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L. Dominici; G. Dagvadorj; J. M. Fellows; S. Donati; D. Ballarini; M. De Giorgi; F. M. Marchetti; B. Piccirillo; L. Marrucci; A. Bramati; G. Gigli; M. H. Szymańska; D. Sanvitto
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Spinorial or multi-component Bose-Einstein condensates may sustain fractional quanta of circulation, vorticant topological excitations with half integer windings of phase and polarization. Matter-light quantum fluids, such as microcavity polaritons, represent a unique test bed for realising strongly interacting and out-of-equilibrium condensates. The direct access to the phase of their wavefunction enables us to pursue the quest of whether half vortices ---rather than full integer vortices---...
Topics: Quantum Gases, Condensed Matter
Source: http://arxiv.org/abs/1403.0487
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A. Rubano; D. Paparo; F. Miletto Granozio; U. Scotti di Uccio; L. Marrucci
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We investigated the nanosecond-scale time decay of the blue-green light emitted by nominally pure SrTiO$_3$ following the absorption of an intense picosecond laser pulse generating a high density of electron-hole pairs. Two independent components are identified in the fluorescence signal that show a different dynamics with varying excitation intensity, and which can be respectively modeled as a bimolecular and unimolecolar process. An interpretation of the observed recombination kinetics in...
Source: http://arxiv.org/abs/0712.0472v1
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A. Savoia; D. Paparo; P. Perna; Z. Ristic; M. Salluzzo; F. Miletto Granozio; U. Scotti di Uccio; C. Richter; S. Thiel; J. Mannhart; L. Marrucci
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The so-called "polar catastrophe", a sudden electronic reconstruction taking place to compensate for the interfacial ionic polar discontinuity, is currently considered as a likely factor to explain the surprising conductivity of the interface between the insulators LaAlO3 and SrTiO3. We applied optical second harmonic generation, a technique that a priori can detect both mobile and localized interfacial electrons, to investigating the electronic polar reconstructions taking place at...
Source: http://arxiv.org/abs/0901.3331v3
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S. Mosca; B. Canuel; E. Karimi; B. Piccirillo; L. Marrucci; R. De Rosa; E. Genin; L. Milano; E. Santamato
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In this paper, we present experimental evidence of a newly discovered third-order nonlinear optical process Self-Induced Spin-to-Orbital Conversion (SISTOC) of the photon angular momentum. This effect is the physical mechanism at the origin of the depolarization of very intense laser beams propagating in isotropic materials. The SISTOC process, like self-focusing, is triggered by laser heating leading to a radial temperature gradient in the medium. In this work we tested the occurrence of...
Source: http://arxiv.org/abs/1008.1283v1
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G. Tosi; F. M. Marchetti; D. Sanvitto; C. Anton; M. H. Szymanska; A. Berceanu; C. Tejedor; L. Marrucci; A. Lemaitre; J. Bloch; L. Vina
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We study, both theoretically and experimentally, the occurrence of topological defects in polariton superfluids in the optical parametric oscillator (OPO) regime. We explain in terms of local supercurrents the deterministic behaviour of both onset and dynamics of spontaneous vortex-antivortex pairs generated by perturbing the system with a pulsed probe. Using a generalised Gross-Pitaevskii equation, including photonic disorder, pumping and decay, we elucidate the reason why topological defects...
Source: http://arxiv.org/abs/1103.3465v2
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E. Nagali; F. Sciarrino; F. De Martini; B. Piccirillo; E. Karimi; L. Marrucci; E. Santamato
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The orbital angular momentum of photons, being defined in an infinitely dimensional discrete Hilbert space, offers a promising resource for high-dimensional quantum information protocols in quantum optics. The biggest obstacle to its wider use is presently represented by the limited set of tools available for its control and manipulation. Here, we introduce and test experimentally a series of simple optical schemes for the coherent transfer of quantum information from the polarization to the...
Source: http://arxiv.org/abs/0902.0740v1
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L. Marrucci; C. Manzo; D. Paparo
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We report the realization of a Pancharatnam-Berry phase optical element [Z. Bomzon, G. Biener, V. Kleiner, and E. Hasman, Opt. Lett. \textbf{27}, 1141 (2002)] for wavefront shaping working in the visible spectral domain, based on patterned liquid crystal technology. This device generates helical modes of visible light with the possibility of electro-optically switching between opposite helicities by controlling the handedness of the input circular polarization. By cascading this approach, fast...
Source: http://arxiv.org/abs/0712.0101v1
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L. Marrucci; C. Manzo; D. Paparo
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We demonstrate experimentally an optical process in which the spin angular momentum carried by a circularly polarized light beam is converted into orbital angular momentum, leading to the generation of helical modes with a wavefront helicity controlled by the input polarization. This phenomenon requires the interaction of light with matter that is both optically inhomogeneous and anisotropic. The underlying physics is also associated with the so-called Pancharatnam-Berry geometrical phases...
Source: http://arxiv.org/abs/0712.0099v1
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C. Manzo; D. Paparo; L. Marrucci; I. Janossy
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We investigate both theoretically and experimentally the rotational dynamics of micrometric droplets of dye-doped and pure liquid crystal induced by circularly and elliptically polarized laser light. The droplets are dispersed in water and trapped in the focus of the laser beam. Since the optical torque acting on the molecular director is known to be strongly enhanced in light-absorbing dye-doped materials, the question arises whether a similar enhancement takes place also for the overall...
Source: http://arxiv.org/abs/0712.0763v1
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V. Parigi; V. D'Ambrosio; C. Arnold; L. Marrucci; F. Sciarrino; J. Laurat
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The full structuration of light in the transverse plane, including intensity, phase and polarization, holds the promise of unprecedented capabilities for applications in classical optics as well as in quantum optics and information sciences. Harnessing special topologies can lead to enhanced focusing, data multiplexing or advanced sensing and metrology. Here we experimentally demonstrate the storage of such spatio-polarization-patterned beams into an optical memory. A set of vectorial vortex...
Topics: Quantum Physics, Optics, Physics
Source: http://arxiv.org/abs/1504.03096
