Single-photon Counting

A single-photon counting sensor for imaging trace chemical cloud. It involves a device called Single-photon Avalanche Diode (SPAD), shown below, capable of creating an avalanche of electrons by a single incident photon. A 2-d Focal Plane Array (FPA) of this SPAD is capable of imaging a large field of view of a chemical cloud.

Slide1Single-photon Avalanche Diode (SPAD) FPA for chemical sensing.

 

 

PhotonPicSingle-photon Avalanche Diode (SPAD) FPA for chemical sensing.

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