Optical crosstalk in SPAD arrays for high-throughput single-molecule fluorescence spectroscopy

Antonino Ingargiola, Maya Segal, Angelo Gulinatti, Ivan Rech, Ivan Labanca, Piera Maccagnani, Massimo Ghioni, Shimon Weiss, Xavier Michalet

Research output: Contribution to journalArticlepeer-review


Single-molecule fluorescence spectroscopy (SMFS), based on the detection of individual molecules freely diffusing through the excitation spot of a confocal microscope, has allowed unprecedented insights into biological processes at the molecular level, but suffers from limited throughput. We have recently introduced a multispot version of SMFS, which allows achieving high-throughput SMFS by virtue of parallelization, and relies on custom silicon single-photon avalanche diode (SPAD) detector arrays. Here, we examine the premise of this parallelization approach, which is that data acquired from different spots is uncorrelated. In particular, we measure the optical crosstalk characteristics of the two 48-pixel SPAD arrays used in our recent SMFS studies, and demonstrate that it is negligible (crosstalk probability ≤1.110−3) and undetectable in cross-correlation analysis of actual single-molecule fluorescence data.

Original languageEnglish
Pages (from-to)255-258
Number of pages4
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
StatePublished - 21 Dec 2018
Externally publishedYes


  • Fluorescence
  • Optical crosstalk
  • SPAD array
  • Single-molecule
  • Spectroscopy

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation


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