23 results found
Lyons A, Oren D, Roger T, et al., 2019, Coherent metamaterial absorption of two-photon states with 40% efficiency, Publisher: AMER PHYSICAL SOC
Manceau M, Vezzoli S, Glorieux Q, et al., 2018, CdSe/CdS Dot-in-Rods Nanocrystals Fast Blinking Dynamics., CHEMPHYSCHEM, Vol: 19, Pages: 3288-3295, ISSN: 1439-4235
Saleh HD, Vezzoli S, Caspani L, et al., 2018, Towards spontaneous parametric down conversion from monolayer MoS<sub>2</sub>, SCIENTIFIC REPORTS, Vol: 8, ISSN: 2045-2322
Vezzoli S, Bruno V, DeVault C, et al., 2018, Optical time reversal from time-dependent epsilon-near-zero media, Physical Review Letters, Vol: 120, ISSN: 0031-9007
Materials with a spatially uniform but temporally varying optical response have applications ranging from magnetic field-free optical isolators to fundamental studies of quantum field theories. However, these effects typically become relevant only for time variations oscillating at optical frequencies, thus presenting a significant hurdle that severely limits the realization of such conditions. Here we present a thin-film material with a permittivity that pulsates (uniformly in space) at optical frequencies and realizes a time-reversing medium of the form originally proposed by Pendry [Science 322, 71 (2008)]. We use an optically pumped, 500 nm thick film of epsilon-near-zero (ENZ) material based on Al-doped zinc oxide. An incident probe beam is both negatively refracted and time reversed through a reflected phase-conjugated beam. As a result of the high nonlinearity and the refractive index that is close to zero, the ENZ film leads to time reversed beams (simultaneous negative refraction and phase conjugation) with near-unit efficiency and greater-than-unit internal conversion efficiency. The ENZ platform therefore presents the time-reversal features required, e.g., for efficient subwavelength imaging, all-optical isolators and fundamental quantum field theory studies.
Roger T, Lyons A, Oren D, et al., 2017, Coherent absorption of two-photon states in metamaterials, Conference on Lasers and Electro-Optics Europe / European Quantum Electronics Conference (CLEO/Europe-EQEC), Publisher: IEEE
Bruno V, Vezzoli S, Roger T, et al., 2017, Deeply sub-wavelength coherent absorption in optically thick ENZ films, Conference on Lasers and Electro-Optics Europe / European Quantum Electronics Conference (CLEO/Europe-EQEC), Publisher: IEEE
Altuzarra C, Vezzoli S, Valente J, et al., 2017, Coherent Perfect Absorption in Metamaterials with Entangled Photons, ACS PHOTONICS, Vol: 4, Pages: 2124-2128, ISSN: 2330-4022
Prain A, Vezzoli S, Westerberg N, et al., 2017, Spontaneous photon production in time-dependent epsilon-near-zero materials, Physical Review Letters, Vol: 118, ISSN: 0031-9007
Quantum field theory predicts that a spatially homogeneous but temporally varying medium will excite photon pairs out of the vacuum state. However, this important theoretical prediction lacks experimental verification due to the difficulty in attaining the required nonadiabatic and large amplitude changes in the medium. Recent work has shown that in epsilon-near-zero (ENZ) materials it is possible to optically induce changes of the refractive index of the order of unity, in femtosecond time scales. By studying the quantum field theory of a spatially homogeneous, time-varying ENZ medium, we theoretically predict photon-pair production that is up to several orders of magnitude larger than in non-ENZ time-varying materials. We also find that while in standard materials the emission spectrum depends on the time scale of the perturbation, in ENZ materials the emission is always peaked at the ENZ wavelength. These studies pave the way to technologically feasible observation of photon-pair emission from a time-varying background with implications for quantum field theories beyond condensed matter systems and with potential applications as a new source of entangled light.
Super-oscillation is a counterintuitive phenomenon describing localized fast variations of functions and fields that happen at frequencies higher than the highest Fourier component of their spectra. The physical implications of this effect have been studied in information theory and optics of classical fields, and have been used in super-resolution imaging. As a general phenomenon of wave dynamics, super-oscillations have also been predicted to exist in quantum wavefunctions. Here we report the experimental demonstration of super-oscillatory behavior of a single-quantum object, a photon. The super-oscillatory behavior is demonstrated by tight localization of the photon wavefunction after focusing with an appropriately designed slit mask to create an interference pattern with a sub-diffraction hotspot (~0.45 λ). Such quantum super-oscillation can be used for low-intensity far-field super-resolution imaging techniques even down to single-photon counting regime, which would be of interest to quantum physics and non-invasive and label-free biological studies.
Altuzarra C, Vezzoli S, Valente J, et al., 2016, "Remote Control" of coherent light absorption with entangled photons, Conference on Lasers and Electro-Optics (CLEO), Publisher: IEEE, ISSN: 2160-9020
Kumar M, Vezzoli S, Wang Z, et al., 2016, Hot exciton cooling and multiple exciton generation in PbSe quantum dots, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 18, Pages: 31107-31114, ISSN: 1463-9076
Vezzoli S, Monceau M, Lemenager G, et al., 2015, Exciton Fine Structure of CdSe/CdS Nano crystals Determined by Polarization Microscopy at Room Temperature, ACS NANO, Vol: 9, Pages: 7992-8003, ISSN: 1936-0851
Roger T, Vezzoli S, Bolduc E, et al., 2015, Coherent perfect absorption in deeply subwavelength films in the single-photon regime, NATURE COMMUNICATIONS, Vol: 6, ISSN: 2041-1723
Pelliser L, Manceau M, Lethiec C, et al., 2015, Alignment of Rod-Shaped Single-Photon Emitters Driven by Line Defects in Liquid Crystals, ADVANCED FUNCTIONAL MATERIALS, Vol: 25, Pages: 1719-1726, ISSN: 1616-301X
Loisel L, Maurice A, Lebental B, et al., 2015, A Graphene-Based Non-Volatile Memory, Conference on Carbon Nanotubes, Graphene, and Emerging 2D Materials for Electronic and Photonic Devices VIII, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, ISSN: 0277-786X
Manceau M, Vezzoli S, Glorieux Q, et al., 2014, Effect of charging on CdSe/CdS dot-in-rods single-photon emission, PHYSICAL REVIEW B, Vol: 90, ISSN: 1098-0121
Shcherbina A, Shcherbina GA, Manceau M, et al., 2014, Photon correlations for colloidal nanocrystals and their clusters, Optics Letters, Vol: 39, Pages: 1791-1794, ISSN: 0146-9592
Images of semiconductor “dot-in-rods” and their small clusters are studied by measuring the second-order correlation function with a spatially resolving intensified CCD camera. This measurement allows one to distinguish between a single dot and a cluster and, to a certain extent, to estimate the number of dots in a cluster. A more advanced measurement is proposed, based on higher-order correlations, enabling more accurate determination of the number of dots in a small cluster. Nonclassical features of the light emitted by such a cluster are analyzed.
Vezzoli S, Shojaii S, Cialdi S, et al., 2013, An ensemble-based method to assess the quality of a sample of nanocrystals as single photon emitters, OPTICS COMMUNICATIONS, Vol: 300, Pages: 215-219, ISSN: 0030-4018
Pisanello F, Lemenager G, Martiradonna L, et al., 2013, Non-Blinking Single-Photon Generation with Anisotropic Colloidal Nanocrystals: Towards Room-Temperature, Efficient, Colloidal Quantum Sources, ADVANCED MATERIALS, Vol: 25, Pages: 1974-1980, ISSN: 0935-9648
Manceau M, Vezzoli S, Pisanello F, et al., 2013, Influence of the shell geometry on the state of charge of CdSe/CdS dot-inrods nanonocrystals, Conference on Lasers and Electro-Optics Europe & International Quantum Electronics Conference (CLEO/Europe-IQEC), Publisher: IEEE
Genoni MG, Olivares S, Brivio D, et al., 2012, Optical interferometry in the presence of large phase diffusion, PHYSICAL REVIEW A, Vol: 85, ISSN: 1050-2947
Phase diffusion represents a crucial obstacle toward the implementation of high-precision interferometric measurements and phase-shift-based communication channels. Here we present a nearly optimal interferometric scheme based on homodyne detection and coherent signals for the detection of a phase shift in the presence of large phase diffusion. In our scheme the ultimate bound to interferometric sensitivity is achieved already for a small number of measurements, of the order of hundreds, without using nonclassical light.
Brivio D, Cialdi S, Vezzoli S, et al., 2010, Experimental estimation of one-parameter qubit gates in the presence of phase diffusion, Physical Review A, Vol: 81, ISSN: 1050-2947
We address estimation of one-parameter qubit gates in the presence of phase diffusion. We evaluate the ultimate quantum limits to precision, seek optimal probes and measurements, and demonstrate an optimal estimation scheme for polarization encoded optical qubits. An adaptive method to achieve optimal estimation in any working regime is also analyzed in detail and experimentally implemented.
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