OPT OPE Archive Optical Archive

Optimization of Silicon Photomultiplier Detectors for Fast Fluorescence Imaging

Improving silicon photomultiplier bandwidth for fast, low-signal applications.


George Funkenbusch


Michael Giacomelli


Silicon Photomultipliers (SiPMs) are attractive alternatives to photomultiplier tubes for low signal applications due to their durability, manufacturability, and affordability. However, their effectiveness in fast applications is limited due to the slow decay in their impulse response. By optimizing our SiPM detector’s readout electronics, we were able to improve the bandwidth from 70 MHz to 315 MHz, achieving a impulse response full-width-half-max of 1.7 ns and a 90-10 fall time of 1.5 ns. This improvement will vastly increase the SiPM’s viability for applications such as LiDAR, PET, and future fluorescence microscopy directions in our lab.

Assembled detector printed circuit board. Printed circuit board was designed to fit into 1 inch lens tubes for ease of alignment.

George Funkenbusch

George Funkenbusch is an undergraduate Optics senior at the University of Rochester. He is primarily interested in biomedical optics including two-photon microscopy, optical coherence tomography, and quantitative phase imaging. George will begin pursuing his PhD in Biomedical Engineering at Duke University in Fall 2022.

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