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Single-Photon Detectors

Jul 2011
ID QuantiqueRequest Info
ID Quantique SA has broadened its id100 single-photon detector family, which features timing resolution as low as 40 ps and suitable dark count rate based on a reliable silicon avalanche photodiode that is sensitive in the visible spectral range. The id100 series detectors are supplied as free-space modules: the id100-20 and id100-50, with a 20- and a 50-μm-diameter photosensitive area, respectively; and as fiber-coupled modules: the id100-SMF20, the id100-MMF50 and the id100-MMF100 supplied with a standard FC/PC optical output. The modules are available in three dark count grades, with rates as low as 2 Hz. Applications include time-correlated single-photon counting, fluorescence and luminescence detection, fluorescence correlation spectroscopy, flow cytometry, DNA sequencing and laser scanning microscopy.


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flow cytometry
A method of measuring the characteristics of microscopic particles, usually cells, as they flow in a fluid stream through a beam of light. Particles may be stained with fluorescent dye and the fluorescence detected via laser illumination.
The emission of light or other electromagnetic radiation of longer wavelengths by a substance as a result of the absorption of some other radiation of shorter wavelengths, provided the emission continues only as long as the stimulus producing it is maintained. In other words, fluorescence is the luminescence that persists for less than about 10-8 s after excitation.
fluorescence correlation spectroscopy
A powerful method, referred to as FCS, for determining the average diffusion coefficients of fluorescent molecules in solution or membranes. FCS measurements rely on recording the transition of several thousands of molecules through the focal volume. The combination of short measurement times along with free positioning or scanning of the observation spot makes FCS an excellent tool for investigating diffusion heterogeneity over time and space.
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