On the Application of a Monolithic Array for Detecting Intensity-Correlated Photons Emitted by Different Source Types

Details On the Application of a Monolithic Array for Detecting Intensity-Correlated Photons Emitted by Different Source Types On the Application of a Monolithic Array for Detecting Intensity-Correlated Photons Emitted by Different Source Types

2009-06-24

arxiv.org/abs/0906.4563v1

Optics Express 17 (2009) 15087--15103

Physics

Quantum Physics

17 pages, 6 figures

Scientific paper

10.1364/OE.17.015087

It is not widely appreciated that many subtleties are involved in the accurate measurement of intensity-correlated photons; even for the original experiments of Hanbury Brown and Twiss (HBT). Using a monolithic 4x4 array of single-photon avalanche diodes (SPADs), together with an off-chip algorithm for processing streaming data, we investigate the difficulties of measuring second-order photon correlations g2 in a wide variety of light fields that exhibit dramatically different correlation statistics: a multimode He-Ne laser, an incoherent intensity-modulated lamp-light source and a thermal light source. Our off-chip algorithm treats multiple photon-arrivals at pixel-array pairs, in any observation interval, with photon fluxes limited by detector saturation, in such a way that a correctly normalized g2 function is guaranteed. The impact of detector background correlations between SPAD pixels and afterpulsing effects on second-order coherence measurements is discussed. These results demonstrate that our monolithic SPAD array enables access to effects that are otherwise impossible to measure with stand-alone detectors.

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