|PASQUINELLI KLAUS||Cycle: XXXIV |
Tutor: GERACI ANGELO
Advisor: ZAPPA FRANCO Major Research topic
:Advanced instrumentation for time-resolved single- and multi-photon counting applicationsAbstract:
Many high-end applications require very sensitive photodetectors and imagers able to measure very faint and very fast optical signals. Example of such applications are distance ranging by measuring photons’ time-of-flight (ToF), fluorescence lifetime imaging or quantum communications. While some photon-starved applications require Single-Photon Avalanche Diode (SPAD) arrays thanks to their single-photon sensitivity, others must operate with either a few or even many photons per event, so Silicon Photomultipliers (SiPM) or alikes should be preferred.My PhD research aims at developing advanced electronic instrumentation based on multi-pixel photon detectors and imagers, able to measure the intensity of light events by counting the number of incoming photons, record the time-resolved optical waveform through the measurement of the photons’ arrival time, and detect the time arrival coincidence in SPAD matrix sensor.To ensure optimal performance in ToF applications, a practical and theoretical study about the photodetector choice will be performed. Starting from the results obtained in previous photodetector modeling, this research will study in deep the performance achievable with both avalanche photodiodes (APD), SPAD and SiPM with variable number of cells.Furthermore, a dedicated hardware with field programmable gate array (FPGA) to detect coincidences will be designed. This will pave the way to a new instrument based on “programmable” SiPM, able to detect photon arrival coincidences with variable thresholds, to be selected based on the operating conditions.