The Geiger regime operation offers a very high signal-to-noise ratio compared to conventional APDs. Therefore the detection of single photons is possible and KETEK SiPMs can easily count single photons but are also capable of being used in CW mode.
The single photon signal of a microcell, the so called Geiger discharge, is asymmetric with a very fast rise time below 1 ns and a recovery time limited by the quenching resistor and the microcell capacitance to a value down to 13 ns.
The internal timing of a microcell Geiger discharge is very fast (below 100 psec). For its latest SiPM series, KETEK has improved the read out network of the microcell array in order to transmit the different microcell signals with very low time jitter to the SiPM output. Best in-class timing values can be achieved with KETEK SiPMs.
All KETEK SiPM products have highly sensitive microcells. The base for the high sensitivity is formed by a very shallow P-doped silicon entrance-window with an antireflective layer on top as well as a high fill factor of this region within the microcell itself.
In summary KETEK SiPM products are combining the benefits of vacuum PMTs (high photon detection efficiency, gain and signal-to-noise) with the benefits of APDs (robustness, miniaturized design, low operation voltage, cost-effective and magnetic insensitivity) to an outstanding low level light sensor with an exceptional performance at low cost. KETEK’s fabless foundry business is offering cost-effective in-time production with scalability to nearly any imaginable customer demand.