Optofluidic particle manipulation in a liquid-core/liquid-cladding waveguide

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This paper describes a method for particle manipulation in a liquid-core/liquid-cladding optical waveguide system. Step-index and graded-index waveguides were modeled with consideration for, respectively, miscible and immiscible core and cladding fluids. The characteristic motions of four different particles with refractive indices of 1.59, 1.48, 1.37, and 1.22 were examined. The guided beam was assumed to be Gaussian in shape. Our results showed that high-refractive-index particles converged at the center of the core fluid due to a positive gradient force, whereas low-refractive-index particles converged at the flow periphery. The nonlinearity of the particle motion increased as the flow velocity and the guided beam waist decreased and the laser power and the particle size increased. The initial beam waist of the guided beam in the graded-index waveguide did not significantly affect the characteristics of the particle motion due to the effects of diffusion. (C) 2012 Optical Society of America
Publisher
OPTICAL SOC AMER
Issue Date
2012-07
Language
English
Article Type
Article
Keywords

REFRACTIVE-INDEX; OPTICAL FORCE; CELL-SEPARATION; LASER; FRACTIONATION; NANOPARTICLES; SYSTEMS; TRAP; BEAM; SIZE

Citation

OPTICS EXPRESS, v.20, no.16, pp.17348 - 17358

ISSN
1094-4087
URI
http://hdl.handle.net/10203/101903
Appears in Collection
ME-Journal Papers(저널논문)
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