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Recently different experimental schemes have been proposed to study theelusive phenomenon of entangled two-photon absorption (ETPA) in nonlinearmaterials. The attempts to detect ETPA using transmission-based schemes haveled to results whose validity is currently under debate since the ETPA signalcan be corrupted or emulated by artifacts associated with linear opticallosses. The present work addresses the issue of linear losses and thecorresponding artifacts in transmission-based ETPA experiments through a newapproach that exploits the properties of a Hong-Ou-Mandel (HOM) interferogram.Here we analyze solutions of Rhodamine B (RhB), commonly used as a model ofnonlinear medium in ETPA studies. Then, by using the HOM interferometer as asensing device, we firstly demonstrate the equivalence of the standardtransmission vs pump power ETPA experiments, presented in many reports, withour novel approach of transmission vs two-photon temporal delay. Secondly, adetailed study of the effects of optical losses, unrelated to ETPA, over theHOM interferogram is carried out by: 1) Characterizing RhB in solutionsprepared with different solvents. 2) Considering scattering losses introducedby silica nanoparticles used as a controlled linear loss mechanism. Our resultsclearly expose the deleterious effects of linear optical losses over the ETPAsignal when standard transmission experiments are employed and show how, byusing the HOM interferogram as a sensing device, it is possible to detect thepresence of such losses. Finally, once we showed that the HOM interferogramdiscriminates properly linear losses, our study also reveals that under thespecific experimental conditions considered here, which are the same than thoseemployed in many reported works, the ETPA was not unequivocally detected.

Entangled two-photon absorption in transmission-based experiments: deleterious effects from linear optical losses