A normally-distributed crosstalk model for silicon photomultipliers

Abstract

Optical crosstalk (OCT) in silicon photomultipliers (SiPM) occurs when photon detection in a microcell leads to the production of further photons that are also detected. Various models have been considered to predict experimental data with varying degrees of success. In this paper, we introduce the Normally-Distributed Crosstalk Model (NDCM), where the probability of triggering additional microcells is given by a 2-d normal distribution with a standard deviation of σ: a device-specific parameter representing OCT photon propagation path length in terms of microcell pitch. Monte Carlo (MC) simulations of NDCM are compared to existing models and experimental data from the CHEC-S camera developed for the Cherenkov Telescope Array, which suggests that OCT occurs with a σ ≈ 5 microcells in this device.

Using quantum entangled photons to measure the absolute photon detection efficiency of a multi-pixel SiPM array

“…Initial MC simulations shows that a ring is formed where the 1-2 photons, although optical crosstalk means that some events 171 may be missed [15]. Work is on-going to verify that this ring is 172 due to SPDC-events, and not from reflections of the laser within 173 the optical arrangement or other structured sources of noise.…”