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25 February 2020 Optofluidic device for sorting microparticles using optical whispering gallery mode resonances
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We describe the use of resonant amplification of light propelling forces for selective separation of fluid-suspended dielectric microparticles. The force amplification and the selectivity of the method is achieved using the whispering gallery mode resonances of the microparticles. The selectivity is determined by the inverse of the quality factor (Q) of the resonances in liquid (with Q ~ 104-106). We demonstrate that the evanescent field around a tapered optical fiber fed with ~20 mW power from a 1064 nm laser can selectively move polystyrene microspheres of up to 20 μm in diameter through distances of more than 50 μm, thereby establishing that the technique is sufficient for efficient separation.
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Alexander S. King, Nathan J. Jordan, Yuhe Chang, Kamil Ekinci, Sean B. Andersson, and Oleksiy Svitelskiy "Optofluidic device for sorting microparticles using optical whispering gallery mode resonances", Proc. SPIE 11283, Integrated Optics: Devices, Materials, and Technologies XXIV, 112831W (25 February 2020);

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