Dr. Leonardo Gasparini Profile

Dr. Leonardo Gasparini

Researcher at Fondazione Bruno Kessler

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Publications (9)

Proceedings Article | 1 August 2021 Presentation + Paper

Preservation of spatial entanglement in surface plasmon polaritons

Bruno Eckmann, André Stefanov, Leonardo Gasparini, Matteo Perenzoni, Branko Kolaric

Proceedings Volume 11806, 118060M (2021) https://doi.org/10.1117/12.2594481

KEYWORDS: Sensors, Surface plasmon polaritons, Nonlinear crystals, Nanostructures, Surface plasmons, Entangled states, Single photon detectors

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Proceedings Article | 13 December 2020 Presentation + Paper

Comparison of proton and electron radiation effects on dark count rate in a CMOS SPAD sensor

Marcello Campajola, Francesco Di Capua, Leonardo Gasperini

Proceedings Volume 11454, 1145409 (2020) https://doi.org/10.1117/12.2559507

KEYWORDS: Sensors, CMOS sensors, Radiation effects, Space operations, CMOS technology, Photons, Logic, Surgery, Manufacturing, Particles

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Proceedings Article | 1 March 2019 Presentation + Paper

Validation of échelle-based quantum-classical discriminator with novelty SPAD array sensor

V. Mitev, L. Balet, N. Torcheboeuf, L. Gasparini, M. Perenzoni, B. Bessire, A. Stefanov, A. Mikhalychev, D. Mogilevtsev, D. Boiko

Proceedings Volume 10934, 109341V (2019) https://doi.org/10.1117/12.2508555

KEYWORDS: Entangled states, Photons, Diffraction, Sensors, Diffraction gratings, Correlation function

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Proceedings Article | 29 May 2018 Presentation

Super-resolution quantum imaging at the Heisenberg limit (Conference Presentation)

Bänz Bessire, Manuel Unternährer, Leonardo Gasparini, Majid Zarghami, Matteo Perenzoni, André Stefanov

Proceedings Volume 10674, 106740F (2018) https://doi.org/10.1117/12.2309773

KEYWORDS: Super resolution, Coherence imaging, Point spread functions, Imaging systems, Light sources, Image resolution, Optical filters, Near field optics, Optical testing, Near field

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The method of optical centroid measurement (OCM) has shown to exhibit spatial super-resolution with enhancements at the Heisenberg limit in plane wave interference experiments. In this work, the OCM method is for the first time used in an imaging setting where actual object features are observed. The OCM result is rederived in a near-field imaging formalism for a general imaging system and in full 2-D treatment. Analogies to coherent and incoherent imaging are shown Moreover, coherent OCM imaging is experimentally implemented for photon number N = 2, where an experimental setup is presented which allows to generate the desired entangled two-photon state containing the super-resolved image. This state is then imaged by an imaging system with a finite resolution defined by its point spread function (PSF). The centroid measurement of the two-photon states delivers then an image with a width of the PSF reduced by a factor 2 corresponding to the Heisenberg limit. In the experiment, the object is illuminated by a continuous-wave pump laser centred at 405nm with an output power of 30mW. A 4-f lens system images the object to the state preparation output plane. In the far-field plane between the lenses, a 5mm long periodically poled KTiOPO4 non-linear crystal generates photon pairs at 810nm by type-0, frequency-degenerate and collinear spontaneous parametric down-conversion. This generated OCM state is then imaged by a single lens and detected in coincidence by a fully digital 2-D sensor array with single-photon sensitivity and per-pixel sub-nanosecond time resolution. The OCM state is spectrally filtered at 810nm. Its imaging capability is compared to classical light sources including spatially coherent, monochromatic illumination at 405nm and 810 nm, as well as spatially incoherent light at 810 nm. The former is implemented using collimated lasers, the latter is a thermal light source spectrally filtered at 810 nm. The PSF of the different light sources are compared at low numerical aperture by imaging a focal point of 25μm Gaussian waist radius.

Proceedings Article | 27 January 2017 Open Access

SUPERTWIN: towards 100kpixel CMOS quantum image sensors for quantum optics applications

Leonardo Gasparini, Bänz Bessire, Manuel Unternährer, André Stefanov, Dmitri Boiko, Matteo Perenzoni, David Stoppa

Proceedings Volume 10111, 101112L (2017) https://doi.org/10.1117/12.2253598

KEYWORDS: Photons, Single photon detectors, Sensors, Image sensors, Quantum optics, CMOS sensors, Imaging systems, CMOS technology, Beam splitters, Image resolution

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Proceedings Article | 13 October 2015 Paper

A low bias variation SPAD-based pixel for a quantum random generator

Nicola Massari, Leonardo Gasparini, Alessandro Tomasi, Alessio Meneghetti, Daniele Perenzoni, David Stoppa

Proceedings Volume 9648, 964813 (2015) https://doi.org/10.1117/12.2195086

KEYWORDS: Light, Photodetectors, Sensors, Light emitting diodes, Quenching (fluorescence), Monte Carlo methods, Single photon, Time correlated photon counting, Solids, Cryptography

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Proceedings Article | 15 May 2014 Paper

Ultra-low power high-dynamic range color pixel embedding RGB to r-g chromaticity transformation

Michela Lecca, Leonardo Gasparini, Massimo Gottardi

Proceedings Volume 9141, 914107 (2014) https://doi.org/10.1117/12.2051528

KEYWORDS: Sensors, RGB color model, Image processing, Skin, High dynamic range imaging, Cameras, Analog electronics, Colorimetry, Facial recognition systems, Imaging systems

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Proceedings Article | 8 May 2014 Paper

SPADnet: a fully digital, scalable, and networked photonic component for time-of-flight PET applications

Claudio Bruschini, Edoardo Charbon, Chockalingam Veerappan, Leo H. Braga, Nicola Massari, Matteo Perenzoni, Leonardo Gasparini, David Stoppa, Richard Walker, Ahmet Erdogan, Robert Henderson, Steve East, Lindsay Grant, Balázs Játékos, Ferenc Ujhelyi, Gábor Erdei, Emöke Lörincz, Luc André, Laurent Maingault, David Jacolin, L. Verger, Eric Gros d'Aillon, Peter Major, Zoltan Papp, Gabor Nemeth

Proceedings Volume 9129, 912913 (2014) https://doi.org/10.1117/12.2051952

KEYWORDS: Sensors, Positron emission tomography, Scintillators, Photons, CMOS sensors, Crystals, Intelligent sensors, Scintillation, Solar concentrators, Data processing

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Proceedings Article | 6 May 2013 Paper

Compact CMOS analog readout circuit for photon counting applications

Ekaterina Panina, Lucio Pancheri, Gian-Franco Dalla Betta, Leonardo Gasparini, David Stoppa

Proceedings Volume 8773, 877305 (2013) https://doi.org/10.1117/12.2020975

KEYWORDS: Analog electronics, Transistors, Device simulation, Photon counting, CMOS technology, Picosecond phenomena, Photodetectors, Monte Carlo methods, Image sensors, Manufacturing

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Showing 5 of 9 publications

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