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Optical trapping and binding of particles in an optofluidic stable Fabry–Pérot resonator with single-sided injection

Abstract : In this article, microparticles 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 a strong intensity gradient. The particles get arranged in a pattern related to the mechanism affecting them: either optical trapping or optical binding. This is proven to eventually translate into either an axial one dimensional (1D) particle array or a cluster of particles. 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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https://hal.archives-ouvertes.fr/hal-01438420
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Noha Ali Aboulela Gaber, Maurine Malak, Frédéric Marty, Dan Angelescu, Elodie Richalot, et al.. Optical trapping and binding of particles in an optofluidic stable Fabry–Pérot resonator with single-sided injection. Lab on a Chip, Royal Society of Chemistry, 2014, 14 (13), pp.2259-2265. ⟨10.1039/c3lc51438b⟩. ⟨hal-01438420⟩

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