Imperial College London

DrStefanoVezzoli

Faculty of Natural SciencesDepartment of Physics

Strategic Teaching Fellow
 
 
 
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Contact

 

s.vezzoli

 
 
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Location

 

816Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

23 results found

Lyons A, Oren D, Roger T, Savinov V, Valente J, Vezzoli S, Zheludev NI, Segev M, Faccio Det al., 2019, Coherent metamaterial absorption of two-photon states with 40% efficiency, Publisher: AMER PHYSICAL SOC

Working paper

Manceau M, Vezzoli S, Glorieux Q, Giacobino E, Carbone L, De Vittorio M, Hermier J-P, Bramati Aet al., 2018, CdSe/CdS Dot-in-Rods Nanocrystals Fast Blinking Dynamics., CHEMPHYSCHEM, Vol: 19, Pages: 3288-3295, ISSN: 1439-4235

Journal article

Lyons A, Roger T, Westerberg N, Vezzoli S, Maitland C, Leach J, Padgett MJ, Faccio Det al., 2018, How fast is a twisted photon?, Publisher: OPTICAL SOC AMER

Working paper

Saleh HD, Vezzoli S, Caspani L, Branny A, Kumar S, Gerardot BD, Faccio Det al., 2018, Towards spontaneous parametric down conversion from monolayer MoS2, SCIENTIFIC REPORTS, Vol: 8, ISSN: 2045-2322

Journal article

Vezzoli S, Bruno V, DeVault C, Roger T, Shalaev VM, Boltasseva A, Ferrera M, Clerici M, Dubietis A, Faccio Det 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.

Journal article

Roger T, Lyons A, Oren D, Savinov V, Valente J, Vezzoli S, Segev M, Zheludev NI, Faccio Det 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

Conference paper

Bruno V, Vezzoli S, Roger T, DeVault C, Ferrera M, Shalaev V, Boltasseva A, Faccio Det 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

Conference paper

Altuzarra C, Vezzoli S, Valente J, Gao W, Soci C, Faccio D, Couteau Cet al., 2017, Coherent Perfect Absorption in Metamaterials with Entangled Photons, ACS PHOTONICS, Vol: 4, Pages: 2124-2128, ISSN: 2330-4022

Journal article

Prain A, Vezzoli S, Westerberg N, Roger T, Faccio Det 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.

Journal article

Yuan GH, Vezzoli S, Altuzarra C, Rogers ETF, Couteau C, Soci C, Zheludev NIet al., 2016, Quantum super-oscillation of a single photon, Light: Science and Applications, Vol: 5, ISSN: 2047-7538

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.

Journal article

Altuzarra C, Vezzoli S, Valente J, Soci C, Faccio D, Couteau C, Zheludevu NIet al., 2016, "Remote Control" of coherent light absorption with entangled photons, Conference on Lasers and Electro-Optics (CLEO), Publisher: IEEE, ISSN: 2160-9020

Conference paper

Kumar M, Vezzoli S, Wang Z, Chaudhary V, Ramanujan RV, Gurzadyan GG, Bruno AF, Soci Cet 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

Journal article

Vezzoli S, Monceau M, Lemenager G, Glorieux Q, Giacobino E, Carbone L, De Vittorio M, Bramati Aet 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

Journal article

Roger T, Vezzoli S, Bolduc E, Valente J, Heitz JJF, Jeffers J, Soci C, Leach J, Couteau C, Zheludev NI, Faccio Det al., 2015, Coherent perfect absorption in deeply subwavelength films in the single-photon regime, NATURE COMMUNICATIONS, Vol: 6, ISSN: 2041-1723

Journal article

Pelliser L, Manceau M, Lethiec C, Coursault D, Vezzoli S, Lemenager G, Coolen L, DeVittorio M, Pisanello F, Carbone L, Maitre A, Bramati A, Lacaze Eet 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

Journal article

Loisel L, Maurice A, Lebental B, Vezzoli S, Cojocaru C-S, Tay BKet 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

Conference paper

Manceau M, Vezzoli S, Glorieux Q, Pisanello F, Giacobino E, Carbone L, De Vittorio M, Bramati Aet al., 2014, Effect of charging on CdSe/CdS dot-in-rods single-photon emission, PHYSICAL REVIEW B, Vol: 90, ISSN: 1098-0121

Journal article

Shcherbina A, Shcherbina GA, Manceau M, Vezzoli S, Carbone L, De Vittorio M, Bramati A, Giacobino E, Chekhova MV, Leuchs Get 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.

Journal article

Vezzoli S, Shojaii S, Cialdi S, Cipriani D, Castelli F, Paris MGA, Carbone L, Cozzoli PD, Giacobino E, Bramati Aet 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

Journal article

Pisanello F, Lemenager G, Martiradonna L, Carbone L, Vezzoli S, Desfonds P, Cozzoli PD, Hermier J-P, Giacobino E, Cingolani R, De Vittorio M, Bramati Aet 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

Journal article

Manceau M, Vezzoli S, Pisanello F, Carbone L, Giacobino E, DeVittorio M, Bramati Aet 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

Conference paper

Genoni MG, Olivares S, Brivio D, Cialdi S, Cipriani D, Santamato A, Vezzoli S, Paris MGAet 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.

Journal article

Brivio D, Cialdi S, Vezzoli S, Gebrehiwot BT, Genoni MG, Olivares S, Paris MGAet 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.

Journal article

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