Entangled two photon absorption cross section on the 808 nm region for the common dyes Zinc tetraphenylporphyrin and Rhodamine B

TL;DR

This paper measures the entangled two-photon absorption cross section at 808 nm for common dyes Zinc tetraphenylporphyrin and Rhodamine B, introducing a new measurement for RhB and analyzing concentration dependence.

Contribution

First measurement of $\sigma_E$ for Rhodamine B at 808 nm and systematic study of its dependence on molecular concentration.

Findings

Measured $\sigma_E$ for ZnTPP and RhB at 808 nm.

First $\sigma_E$ measurement for RhB.

Demonstrated concentration dependence of $\sigma_E$.

Abstract

We report the measurement of the entangled two photon absorption cross section, $\sigma_E$, at 808 nm on organic chromophores in solution in a low photon flux regime. We performed measurements on Zinc tetraphenylporphyrin (ZnTPP) in Toluene and Rhodamine B (RhB) in Methanol. This is, to the best of our knowledge, the first time that $\sigma_E$ is measured for RhB. Additionally, we report a systematic study of the dependence of $\sigma_E$ on the molecular concentration for both molecular systems. In contrast to previous experiments, our measurements are based on detecting the pairs of photons that are transmitted by the molecular system. By using a coincidence count circuit it was possible to improve the signal to noise ratio. This type of work is important for the development of spectroscopic and microscopic techniques using entangled photons.