A method for detecting photons includes subjecting a photodiode formed in a semi-conductive material, to a bias voltage such that an avalanche phenomenon can appear when a photon enters the photodiode in an avalanche layer extending into the semi-conductive material down to minimum and maximum depths so that it can be reached by photons having a wavelength between minimum and maximum wavelengths. The method also includes comparing the amplitude of a signal supplied by the photodiode with two threshold values, and deducing that the photodiode received a photon having a wavelength between two threshold wavelengths ranging between the minimum and maximum wavelengths, if the amplitude of the signal is between the two threshold values.
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