A silicon photomultiplier (SiPM) contains an array of microcells that can each detect individual photons. Consequently, it can arguably result in the most sensitive receiver in visible light ...

HAWC caught the monster cosmic rays The High‑Altitude Water Cherenkov Observatory (HAWC) in Mexico uses 300 steel tanks filled with clear water and instrumented with four photomultiplier tubes apiece.

We developed a fully digital Silicon Photomultiplier (dSiPM) of 3.8 mm × 3.3 mm in size containing 8188 individual Geiger-mode cells. Each detected photon is directly converted into a digital signal ...