title: Entangled Photon Excited Fluorescence in Organic Materials: An Ultrafast Coincidence Detector.
abstract: We report the fluorescence emission from organic systems selectively excited by entangled pairs of photons. We have demonstrated a linear dependence of this two-photon excited fluorescence on the excitation intensity which is a unique nonclassical feature of two-photon interactions induced by entangled photons. The entangled photon (ETPA) excited fluorescence has been detected in several organic molecules possessing a high entangled photon absorption cross section. The ETPA fluorescence showed a nonmonotonic dependence on the delay between signal and idler beams. The fluorescence signal was detectable within the signal-idler relative delay time interval of ∼100 fs. This time is comparable with the estimated entanglement time, TE, making the ETPA-excited fluorescence in organic materials an ideal ultrafast coincidence detector. These results have widespread impact in applications ranging from spectroscopy to chemical and biological sensing, imaging, and microscopy.
authors.affiliation: Department of Chemistry, Department of Applied Physics, Department of Macromolecular Science and Engineering, University of Michigan , Ann Arbor, Michigan 48109, United States.
authors.forename: Oleg
authors.initials: O
authors.lastname: Varnavski
authors.affiliation: Department of Chemistry, Department of Applied Physics, Department of Macromolecular Science and Engineering, University of Michigan , Ann Arbor, Michigan 48109, United States.
authors.forename: Brian
authors.initials: B
authors.lastname: Pinsky
authors.affiliation: Department of Chemistry, Department of Applied Physics, Department of Macromolecular Science and Engineering, University of Michigan , Ann Arbor, Michigan 48109, United States.
authors.forename: Theodore
authors.identifier: http://orcid.org/0000-0003-2453-2290
authors.initials: T
authors.lastname: Goodson