title: Photon cross-correlation spectroscopy to 10-ns resolution.
abstract: We describe a low-cost modification based on the research of Arecchi et al. [Opt. Commun. 3, 284-288 (1971)] on a standard photon correlation spectroscopy setup for measuring small (approximately equal 1%) and fast (resolution, approximately equal 10 ns) light fluctuations. Details of the electronics and optics permit the apparatus to be easily reproduced. Careful tests show that spurious correlations of <or=1% can be achieved with standard detectors only when taking precautions with the electronics. Moreover, measurements on latex spheres, ellipsoids, and protein solutions show that fast and very small light fluctuations ( approximately equal 1-5%) can be studied versus scattering vector and light polarization.
authors.affiliation: Dipartimento di Fisica, Istituto Nazionale di Fisica per la Materia, Via Celoria 16, I-20131 Milano, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Chirico
authors.forename: M
authors.initials: M
authors.lastname: Gardella