Silicon Photodiode

Definition: A silicon photodiode (SiPD) is a silicon solid-state device that takes photons in and puts electrons out, usually at the rate of about 5 electrons out for every 10 photons. It produces current when photons impinge upon it; a silicon photodiode does not require an external power source in order to operate. SiPDs are commonly used as detectors in fNIRS systems because they are sensitive to light in the near-infrared spectrum. They are compact, fast, and have low noise, making them well-suited for use in wearable fNIRS systems besides laboratory systems.

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References: https://doi.org/10.1364/AO.39.006466

Related terms: Detector, Sensor