Titre: What do neutrino physics, dark matter searches, medical imaging and quantum key distribution instrumentation have in common?
Conférencier: Jean-François Pratte , Institut interdisciplinaire d’innovation technologique 3IT, Université de Sherbrooke, Sherbrooke, QC, Canada
Lieu: Via Zoom - https://us02web.zoom.us/j/83128807725?pwd=b0FGUkVDR1dTZ0d4OWEyMTc3SzZ ,
Date et heure: mercredi le 09 juin 2021 de 13:00 à 14:00

Résumé: What do neutrino physics, dark matter searches, medical imaging and quantum key distribution instrumentation have in common? Here’s a hint: single photon sensitivity. To this end, our team is working on the implementation of 3D Photon-to-Digital Converters (3D-PDCs, a.k.a. 3D digital SiPMs) which are each composed of an array of single photon avalanche diodes (SPAD) integrated vertically in 3D with their microelectronic readout circuit, enabling direct photon-to-bit conversion and embedded digital signal processing. For particle physics experiments where 5 to 250 m2 of photosensitive area is required to operate at cryogenic temperatures, 3D-PDCs are developed for very low power operation. For medical imaging, such as PET and CT, as well as quantum key distribution receivers, the most important specification is single photon timing resolution, with a general effort from the community to achieve sub 10 ps FWHM. The team at Université de Sherbrooke is working on every step of the design, fabrication and implementation of the 3D-PDC. SPAD array and 3D bonding processes are developed on Teledyne-DALSA’s (Bromont, Canada) 6” CCD fabrication line, while CMOS (TSMC 180 nm and TSMC 65 nm) readout circuits are custom-designed to the various experiments’ requirements. Also, key enabling technologies are required to build photodetection modules based on 3D-PDCs, for instance large scale silicon interposers and ultra-low power silicon photonic communication modules. This talk will present an overview of 3D-PDC and photodetection module development at Sherbrooke, and the experiments motivating this research.

Note biographique: Jean-François Pratte received his M.A. Sc. in electrical engineering at Université de Sherbrooke, Sherbrooke, Canada in 2002. He then held a position as a research engineer at the Instrumentation Division of Brookhaven National Laboratory (BNL, U.S. DOE) and obtained in parallel his Ph.D. in 2008 for the realization of the RatCAP (Rat Conscious Animal PET scanner). He was a key designer in the implementation of the first dual modality PET and magnetic resonance imaging scanner. While at BNL, he coauthored 3 patents—all transferred to industry, one paper in Nature Methods and contributed to the startup of a company.

In 2009, he joined the Electrical and Computer Engineering Department at Université de Sherbrooke where he currently holds a professor position. His research interests target microsystem design and integration of Photon-to-Digital Converters, where an array of single photon avalanche diodes is integrated vertically in 3D with a pixelated CMOS readout circuit. His current research areas are: radiation instrumentation for neutrino physics (neutrinoless double beta decay—member of the nEXO collaboration), dark matter searches and medical imaging (positron emission tomography) as well as quantum key distribution receivers and time-to-digital converters. He was awarded the prestigious 2018 Radiation Instrumentation Early Career Award of the IEEE Nuclear and Plasma Science Society “For Spearheading the Development of per Pixel Picosecond Timing with Single Photon Avalanche Diodes Three-Dimensionally Integrated to Custom Readout Circuits”.

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