Understanding the Nonlinear Response of SiPMs

Area of Science:

• Photonics and Detector Physics
• Computational Physics

Background:

• Silicon Photomultipliers (SiPMs) are crucial in various scientific applications requiring high sensitivity.
• Understanding SiPM nonlinear response is essential for accurate data acquisition.

Purpose of the Study:

• To systematically investigate the nonlinear response of SiPMs using Monte Carlo simulations.
• To identify and quantify the factors influencing SiPM nonlinearity.
• To develop predictive models for SiPM nonlinear behavior.

Main Methods:

• Monte Carlo (MC) simulations were employed to model SiPM behavior.
• The MC code was rigorously validated against experimental data from two distinct SiPMs.
• Phenomenological fitting models were developed for different light pulse shapes.

Main Results:

• SiPM nonlinearity is primarily governed by the interplay between photon rate and pixel recovery time.
• Factors such as light pulse shape, correlated noise, and readout impedance also influence nonlinearity.
• Correlated noise has a minor effect on nonlinearity but significantly impacts output current shape.
• Two phenomenological models accurately describe SiPM nonlinear responses for various pulse shapes.

Conclusions:

• The developed models offer a few-percent accuracy in describing SiPM nonlinear responses across diverse conditions.
• This work provides valuable insights for optimizing SiPM performance in experimental setups.
• The study enhances the understanding and predictability of SiPMs in scientific instrumentation.