alpha2cen Posted December 15, 2010 Posted December 15, 2010 (edited) Very small scale detection, how can we make? About visible light photon detection. Without amplification, how small amount of photon can we detect? Photon might hit electrons on the solid surface and make free electrons. At that time we have to consider lower limit of photon energy and photon number. Produced electric current and voltage should be sufficient to detect. The lower limit? Edited December 15, 2010 by alpha2cen
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