Physics – Quantum Physics
Scientific paper
2005-03-04
Optics Letters, 30(2), 123 (2005)
Physics
Quantum Physics
10 pages, 4 figures
Scientific paper
10.1364/OL.30.000123
A highly sensitive photodetection system with a detection limit of 1 photon/s was developed. This system uses a commercially available 200-mm-diameter silicon avalanche photodiode (APD) and an in-house-developed ultralow-noise readout circuit, which are both cooled to 77 K. When the APD operates at a low gain of about 10, it has a high-linearity response to the number of incident photons and a low excess noise factor. The APD also has high quantum efficiency and a dark current of less than 1 e/s at 77 K. This photodetection system will shorten the measurement time and enable higher spatial and wavelength resolution for near-field scanning optical microscopes.
Akiba Makoto
Fujiwara Mikio
Sasaki Masahide
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