Experimental study on the effects of photon-pair temporal correlations in entangled two-photon absorption

• URL: http://arxiv.org/abs/2101.10987v1
• Date: Tue, 26 Jan 2021 18:31:09 GMT
• Title: Experimental study on the effects of photon-pair temporal correlations in entangled two-photon absorption
• Authors: Samuel Corona-Aquino, Omar Calder\'on-Losada, Mayte Y. Li-G\'omez, H\'ector Cruz-Ramirez, Violeta Alvarez-Venicio, Mar\'ia del Pilar Carre\'on-Castro, Roberto de J. Le\'on-Montiel, Alfred B. U'Ren
• Abstract summary: Entangled two-photon absorption (ETPA) has recently become a topic of lively debate. This work provides a thorough experimental study of ETPA in Rhodamine B and Zinc Tetraphenylporphirin.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Entangled two-photon absorption (ETPA) has recently become a topic of lively debate, mainly due to the apparent inconsistencies in the experimentally-reported ETPA cross sections of organic molecules. In this work, we provide a thorough experimental study of ETPA in the organic molecules Rhodamine B (RhB) and Zinc Tetraphenylporphirin (ZnTPP). The goal of this contribution is twofold: on one hand, it seeks to reproduce the results of previous experimental reports and, on the other, it aims to determine the effects of different temporal correlations -- introduced as a controllable time-delay between the photons to be absorbed -- on the strength of the ETPA signal. In our experiment, the samples are excited by entangled pairs produced by type-I SPDC, with a spectral distribution centered at 810 nm. Surprisingly, and contrary to what was expected, the time delay did not produce in our experiments any systematic change in the cross-sections when monitoring the ETPA signal using a transmission measurement scheme. As a plausible cause of this unexpected result, we argue that the photon-pair flux, typically-used in these experiments, is not sufficient to promote the two-photon absorption process in these molecules. This suggests that the actual absorption cross-section values are lower than those previously reported, and therefore do not lead to a measurable ETPA effect for the transmission method.

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