UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

Guest
2024-11-22 1:49
 HOME     CONFERENCES     SEARCH            LOGIN     NEW USER     IMAGES   


Conference: Bucharest University Faculty of Physics 2015 Meeting


Section: Optics, Spectroscopy, Plasma and Lasers


Title:
Comparison between emission spectra of pendant droplets containing dye solutions and emulsions


Authors:
Mihai BONI(1,2),Viorel NASTASA(1), Ionut Relu ANDREI(1), Angela STAICU(1), Mihail-Lucian PASCU(1,2)


Affiliation:
1)National Institute for Laser, Plasma and Radiation Physics, Romania

2)Faculty of Physics, University of Bucharest, Romania


E-mail
mihai.boni@inflpr.ro


Keywords:
lasing, fluorescence, droplets


Abstract:
In this paper are presented results about resonant interaction between laser beams and droplets containing dye solutions and emulsions generated with microfluidics technology. Fluorescence emission of solutions of Rhodamine 6G (Rh6G) in pendant droplets in distilled water is measured as well as of emulsions of Rh6G in water and Oily Vitamin A. The excitation is made with the second harmonic beam emitted by a pulsed Nd:YAG laser system at 532 nm. Emission spectra measured for pendant droplets containing Rh6G water solution show besides broadband fluorescence an additional peak attributed to lasing effect. At the same time, for a pendant droplet containing emulsion is obtained an enhanced fluorescence with respect to measurements made in bulk or in droplets which contain solutions (not emulsions) of Rh6G in ultrapure water(1). The results can be useful in optical imaging, since they can lead to the use of smaller quantities of fluorescent dyes to obtain the same quality of results. By increasing pumping energy, a narrow lasing line is also obtained in this case. In both systems, the peak wavelength of lasing signal depends on droplet content. This can lead to generation of tuneable micro-lasers that may be used in medical/technological applications. The authors from NILPRP acknowledge the financing of the research by MEN-CDI Nucleu project: PN0939/2009 and CNCS – UEFISCDI by project number PN-II-ID-PCE-2011-3-0922, and University of Bucharest, Faculty of Physics.


References:

1)M. Boni, V. Nastasa, I. R. Andrei, Angela Staicu, and M. L. Pascu, Enhanced fluorescence emitted by microdroplets containing organic dye emulsions, Biomicrofluidics 9, 014126 (2015); doi: 10.1063/1.4913648

Acknowledgement:
The authors from NILPRP acknowledge the financing of the research by MEN-CDI Nucleu project: PN0939/2009 and CNCS – UEFISCDI by project number PN-II-ID-PCE-2011-3-0922, and University of Bucharest, Faculty of Physics.