Prof. Gian-Franco Dalla Betta Profile

Prof. Gian-Franco Dalla Betta

Professor at Univ degli Studi di Trento - VAT 00340520220

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Publications (8)

Proceedings Article | 24 August 2017 Paper

A pixelated x-ray detector for diffraction imaging at next-generation high-rate FEL sources

L. Lodola, L. Ratti, D. Comotti, L. Fabris, M. Grassi, P. Malcovati, M. Manghisoni, V. Re, G. Traversi, C. Vacchi, G. Batignani, S. Bettarini, F. Forti, G. Casarosa, F. Morsani, A. Paladino, E. Paoloni, G. Rizzo, M. Benkechkache, G.-F. Dalla Betta, R. Mendicino, L. Pancheri, G. Verzellesi, H. Xu

Proceedings Volume 10392, 103920D (2017) https://doi.org/10.1117/12.2276966

KEYWORDS: Free electron lasers, Sensors, X-ray detectors, X-rays, Diffraction, CMOS technology, X-ray sources, X-ray imaging, Image sensors, Synchrotrons

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SPIE Journal Paper | 1 June 2016

Cross-talk characterization of dense single-photon avalanche diode arrays in CMOS 150-nm technology

Hesong Xu, Lucio Pancheri, Leo H. Braga, Gian-Franco Dalla Betta, David Stoppa

OE, Vol. 55, Issue 06, 067102, (June 2016) https://doi.org/10.1117/12.10.1117/1.OE.55.6.067102

KEYWORDS: Integrated optics, Avalanche photodiodes, CMOS technology, Sensors, Structural design, Imaging systems, Optical engineering, Multiplexers, Photodetectors, Single photon detectors

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Proceedings Article | 7 March 2014 Paper

Design and characterization of avalanche photodiodes in submicron CMOS technologies

L. Pancheri, T. Bendib, G.-F. Dalla Betta, D. Stoppa

Proceedings Volume 8982, 898211 (2014) https://doi.org/10.1117/12.2037566

KEYWORDS: Avalanche photodetectors, Doping, Electrons, Ionization, Near infrared, Avalanche photodiodes, Quantum efficiency, Amplifiers, CMOS technology, Instrument modeling

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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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Proceedings Article | 14 May 2010 Paper

Simulation modelling of a micro-system for time-resolved fluorescence measurements

Marina Repich, David Stoppa, Bruce Rae, Robert Henderson, Gian-Franco Dalla Betta

Proceedings Volume 7726, 77261I (2010) https://doi.org/10.1117/12.853810

KEYWORDS: Sensors, Time resolved spectroscopy, Light sources, Modeling, Luminescence, Electro optical modeling, Quenching (fluorescence), Systems modeling, Single photon, Detector arrays

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Proceedings Article | 14 May 2010 Paper

A 120x160 pixel CMOS range image sensor based on current assisted photonic demodulators

Lucio Pancheri, David Stoppa, Nicola Massari, Mattia Malfatti, Lorenzo Gonzo, Quazi Hossain, Gian-Franco Dalla Betta

Proceedings Volume 7726, 772615 (2010) https://doi.org/10.1117/12.854438

KEYWORDS: Modulation, Cameras, Sensors, Electrodes, Image sensors, Imaging systems, Distance measurement, Phase shift keying, Phase measurement, Correlation function

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Proceedings Article | 6 May 2010 Paper

Highly parallel SPAD detector for time-resolved lab-on-chip

Michele Benetti, Daniele Iori, Lucio Pancheri, Fausto Borghetti, Laura Pasquardini, Lorenzo Lunelli, Cecilia Pederzolli, Lorenzo Gonzo, Gian-Franco Dalla Betta, David Stoppa

Proceedings Volume 7723, 77231Q (2010) https://doi.org/10.1117/12.854565

KEYWORDS: Sensors, Luminescence, Chemical elements, Microfluidics, CMOS sensors, CMOS technology, Optical simulations, CCD image sensors, Monte Carlo methods, Electronics

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Fluorescence lifetime detection is widely used in molecular biology to monitor many cell parameters (such as pH, ion concentrations, etc.) and for an early diagnosis of many pathologies. In a typical fluorescence lifetime experiment a pulsed laser is used to excite the fluorescent dyes and the emitted light is revealed by means of high sensitivity detectors, typically: intensified CCD, PMTs or Single-Photon Avalanche Diodes (SPADs).In this contribute we present a SPAD detector module fabricated in a 0.35μm High Voltage CMOS technology to be used within a lab-on-chip system consisting of a micro-reactor array for bioaffinity assays based on fluorescence markers. The detector module, having a total area of 600 x 900 μm2, can be arranged to build a small pixel array to be directly coupled to the micro-reactors. No emission filters are needed, since the ultra-short laser pulse is cut off in the time domain. The module consists of a 10x10-SPAD array, where each SPAD cell is equipped with dedicated active quenching and recharging circuit. Each cell has a pitch of 26μm with a fill factor of 48%. The SPADs have been binned in order to realize a large photosensitive area detector exhibiting a reasonably low dark count rate (DCR) and reduced dead time, as required in a fast measurement system. A memory has also been implemented in order to enable only low DCR SPADs, so that a total DCR of about 100kHz can be achieved for the whole photosensitive area. The digital output generated by the SPAD array is sent to a time-discriminator stage which allows a time-gated detection of the incident light. Two time-windows have been implemented in this architecture. Their time width is controlled by an on-chip digital PLL locked to the external laser clock whereas the width of the time-windows can be set within the range 500ps-10ns with a resolution of 500ps. Photons detected within each time window are then counted by two 10-bits digital counters. Time-interleaved operation has been implemented to read out the pixel data in parallel with the photon detection phase.

Proceedings Article | 18 May 2009 Paper

Simulation modelling for the analysis and the optimal design of SPAD detectors for time-resolved fluorescence measurements

Marina Repich, David Stoppa, Lucio Pancheri, Gian-Franco Dalla Betta

Proceedings Volume 7355, 73550O (2009) https://doi.org/10.1117/12.820430

KEYWORDS: Luminescence, Sensors, CMOS sensors, Time resolved spectroscopy, Monte Carlo methods, Optical simulations, Modeling, Photodetectors, Quenching (fluorescence), Avalanche photodiodes

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