Setting bounds on two-photon absorption cross-sections in common fluorophores with entangled photon pair excitation

• URL: http://arxiv.org/abs/2008.02664v3
• Date: Thu, 18 Feb 2021 21:24:27 GMT
• Title: Setting bounds on two-photon absorption cross-sections in common fluorophores with entangled photon pair excitation
• Authors: Kristen M. Parzuchowski, Alexander Mikhaylov, Michael D. Mazurek, Ryan N. Wilson, Daniel J. Lum, Thomas Gerrits, Charles H. Camp Jr., Martin J. Stevens and Ralph Jimenez
• Abstract summary: We use a fluorescence-based registration scheme to experimentally determine upper bounds on the cross-sections for six fluorophores. For two samples that have been studied by others, Rhodamine 6G and 9R-S, we measure upper bounds four and five orders of magnitude lower than the previously reported cross-sections.
• Score: 48.7576911714538
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Excitation with entangled photon pairs may lead to an increase in the efficiency of two-photon absorption at low photon flux. The corresponding process, entangled two-photon absorption (E2PA), has been investigated in numerous theoretical and experimental studies. However, significant ambiguity and inconsistency remain in the literature about the absolute values of E2PA cross-sections. Here, we use a fluorescence-based registration scheme to experimentally determine upper bounds on the cross-sections for six fluorophores. These bounds are up to four orders of magnitude lower than the smallest published cross-section. For two samples that have been studied by others, Rhodamine 6G and 9R-S, we measure upper bounds four and five orders of magnitude lower than the previously reported cross-sections.

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