Is it possible to have a photon counting using a photodiode?
I know the best option is using PTM, but they are very expensive and sensitive.
I need a cheap and sensitive photodiode for photon counting.
If anyone knows, he will introduce a model of these photodiode.
With special thanks
Yes, there are commercially available avalanche photodiodes capable of detecting single photons. They vary in price, and the most important quantity you need to know is your acceptable dark count rate. For instance, Perkin Elmer manufactures photon counters with dark count rates ranging from 25 counts/second up to 1500 counts/second (the price varies accordingly!). The typical detection efficiency is around 60-70% and depends on wavelength. You should employ suitable filters to ensure that you detect only the light that you intend to.
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