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Conference on Lasers and Electro-Optics

Setting limits on two-photon absorption cross sections in common fluorescent molecules with entangled photon pairs excitation

Alexander Mikhaylov, Kristen M. Parzuchowski, Michael D. Mazurek, Ryan N. Wilson, Thomas Gerrits, Daniel J. Lum, Charles H. Camp, Martin J. Stevens, Ralph Jimenez

Published Jan 1, 2020• 1 citation
Publisher

Abstract

We present a detailed study of two-photon absorption in some common fluorescent molecules with excitation by entangled photon pairs. Using fluorescence and transmittance measurements, we set an upper bound on the absorption cross sections.
DOI
10.1364/cleo_at.2020.jth3n.4

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We experimentally study entangled two-photon absorption in rhodamine 6G as a function of the spatial properties of a high flux of broadband entangled photon pairs. We first demonstrate a key signature dependence of the entangled two-photon absorption rate on the type of entangled pair flux attenuation: linear, when the laser pump power is attenuated, and quadratic, when the pair flux itself experiences linear loss. We then perform a fluorescence-based Z-scan measurement to study the influence of beam waist size on the entangled two-photon absorption process and compare this to classical single- and two-photon absorption processes. We demonstrate that the entangled two-photon absorption shares a beam waist dependence similar to that of classical two-photon absorption. This result presents an additional argument for the wide range of contrasting values of quoted entangled two-photon absorption cross sections of dyes in literature.