Enhanced fluorescence emitted by microdroplets containing organic dye emulsions

Biomicrofluidics
M BoniM L Pascu

Abstract

In this paper, laser beam resonant interaction with pendant microdroplets that are seeded with a laser dye (Rhodamine 6G (Rh6G)) water solution or oily Vitamin A emulsion with Rhodamine 6G solution in water is investigated through fluorescence spectra analysis. The excitation is made with the second harmonic generated beam emitted by a pulsed Nd:YAG laser system at 532 nm. The pendant microdroplets containing emulsion exhibit an enhanced fluorescence signal. This effect can be explained as being due to the scattering of light by the sub-micrometric drops of oily Vitamin A in emulsion and by the spherical geometry of the pendant droplet. The droplet acts as an optical resonator amplifying the fluorescence signal with the possibility of producing lasing effect. Here, we also investigate how Rhodamine 6G concentration, pumping laser beam energies and number of pumping laser pulses influence the fluorescence behavior. The results can be useful in optical imaging, since they can lead to the use of smaller quantities of fluorescent dyes to obtain results with the same quality.

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Citations

Feb 22, 2017·Reports on Progress in Physics·D McGloin
Dec 11, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Mihai BoniAngela Staicu
Apr 15, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Andra DinacheMihaela Oana Romanitan
Apr 4, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Mihail Lucian Pascu

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