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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 24 — Nov. 23, 2009
  • pp: 22054–22061

Detection of counterfeit U.S. paper money using intrinsic fluorescence lifetime

Thomas H. Chia and Michael J. Levene  »View Author Affiliations

Optics Express, Vol. 17, Issue 24, pp. 22054-22061 (2009)

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Genuine U.S. Federal Reserve Notes have a consistent, two-component intrinsic fluorescence lifetime. This allows for detection of counterfeit paper money because of its significant differences in fluorescence lifetime when compared to genuine paper money. We used scanning two-photon laser excitation and the time-correlated single photon counting (TCSPC) method to sample a ~4 mm2 region. Three types of counterfeit samples were tested. Four out of the nine counterfeit samples fit to a one-component decay. Five out of nine counterfeit samples fit to a two-component model, but are identified as counterfeit due to significant deviations in the longer lifetime component compared to genuine bills.

© 2009 OSA

OCIS Codes
(170.3650) Medical optics and biotechnology : Lifetime-based sensing
(190.0190) Nonlinear optics : Nonlinear optics
(300.2530) Spectroscopy : Fluorescence, laser-induced

ToC Category:
Nonlinear Optics

Original Manuscript: October 2, 2009
Revised Manuscript: November 6, 2009
Manuscript Accepted: November 11, 2009
Published: November 17, 2009

Thomas H. Chia and Michael J. Levene, "Detection of counterfeit U.S. paper money using intrinsic fluorescence lifetime," Opt. Express 17, 22054-22061 (2009)

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