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Proceedings Paper

In-depth analysis of optical crosstalk in single-photon avalanche diode arrays
Author(s): Ivan Rech; Antonino Ingargiola; Roberto Spinelli; Ivan Labanca; Stefano Marangoni; Massimo Ghioni; Sergio Cova
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Paper Abstract

One of the main drawbacks of Single Photon Avalanche Diode arrays is the optical crosstalk between adjacent detectors. This phenomenon represents a fundamental limit to the density of arrays, since the crosstalk increases with reducing the distance between adjacent devices. In the past, crosstalk was mainly ascribed to the light propagating from one detector to another through a direct optical path. Accordingly, deep trenches coated with metal were introduced as optical isolation barriers between pixels. This solution, however, was unable to completely prevent the crosstalk. In this paper we present experimental evidence that a significant contribution to crosstalk comes from photons reflected internally at the bottom of the chip. These photons can bypass trenches making them ineffective. We also propose an optical model suitable to predict the dependence of crosstalk on the position within the array.

Paper Details

Date Published: 15 October 2007
PDF: 10 pages
Proc. SPIE 6771, Advanced Photon Counting Techniques II, 677111 (15 October 2007); doi: 10.1117/12.733772
Show Author Affiliations
Ivan Rech, Politecnico di Milano (Italy)
Antonino Ingargiola, Politecnico di Milano (Italy)
Roberto Spinelli, Politecnico di Milano (Italy)
Ivan Labanca, Politecnico di Milano (Italy)
Stefano Marangoni, Politecnico di Milano (Italy)
Massimo Ghioni, Politecnico di Milano (Italy)
Sergio Cova, Politecnico di Milano (Italy)

Published in SPIE Proceedings Vol. 6771:
Advanced Photon Counting Techniques II
Wolfgang Becker, Editor(s)

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