High-Time Resolved Two-Dimensional Tetra-Lateral Position-Sensitive Silicon Photomultiplier

Abstract

A 2D tetra-lateral position-sensitive silicon photomultiplier (PS-SiPM) has the advantages of high position and photon-number resolutions and only four readout channels for imaging application. However, its time resolution is limited by the position-dependent transmission time-delay effect. In this letter, we report a method to deduct the time jitter caused by transmission time delay and to significantly improve the time resolution of PS-SiPM. Instrument response function of as low as 177.6 ps (full width at half maximum) and position measured error of $44.5 \pm 34.5~ \mu \text{m}$ were obtained at a mean photoelectron number (MPEN) of approximately 14 for the device with active area of $2.77\,\, \text {mm}\times 2.77\,\, \text {mm}$ and micro-APD cell number of $277\times 277$ . The single photon position resolution was $\sim 240.7 ~\mu \text{m}$ . The position resolution was improved from 214.9 to $19.3~\mu \text{m}$ when the MPEN increased from 2.3 to 42. Thus, a PS-SiPM with simultaneous high time, position, and photon-number resolutions is realized.