Noha Gaber, Maurine Malak, Frédéric Marty, Dan E. Angelescu, Elodie Richalot, Tarik Bourouina
In this article, micro particles are manipulated inside an optofluidic Fabry–Pérot cylindrical cavity embedding a fluidic capillary tube, taking advantage of field enhancement and multiple reflections within the optically-resonant cavity. This enables trapping of suspended particles with single-side injection of light and with low optical power. A Hermite-Gaussian standing wave is developed inside the cavity, forming trapping spots at the locations of the electromagnetic field maxima with strong intensity gradient. The particles get arranged in a pattern related to the mechanism affecting them: either optical trapping and/or optical binding. This is proven to eventually translate into either an axial one dimensional (1D) particle array or a cluster of particles, respectively. Numerical simulations are performed to model the field distributions inside the cavity allowing a behavioral understanding of the phenomena involved in each case.
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