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In this paper we present an array of 48 Single Photon Avalanche Diodes (SPADs) specifically designed for multispot Single Molecule Analysis. The detectors have been arranged in a 12x4 square geometry with a pitch-to-diameter ratio of ten in order to minimize the collection of the light from non-conjugated excitation spots. In order to explore the tradeoffs between the detectors’ performance and the optical coupling with the experimental setup, SPADs with an active diameter of 25 and of 50μm have been manufactured. The use of a custom technology, specifically designed for the fabrication of the detectors, allowed us to combine a high photon detection efficiency (peak close to 50% at a wavelength of 550nm) with a low dark count rate compatible with true single molecule detection. In order to allow easy integration into the optical setup for parallel single-molecule analysis, the SPAD array has been incorporated …
International Society for Optics and Photonics
Publication date: 
4 Feb 2013

Angelo Gulinatti, Ivan Rech, Piera Maccagnani, Massimo Ghioni

Biblio References: 
Volume: 8631 Pages: 86311D
Quantum Sensing and Nanophotonic Devices X