| ABSTRACT |
Optical trapping of particles has become a powerful non-mechanical and non destructive technique for precise particle positioning. The manipulation of particles in the evanescent field of a channel waveguide potentially allows for sorting and trapping of several particles and cells simultaneously. In the evanescent field above an optical channel waveguide, particles experience three optical forces : i) a transvere gradient force, which act in the direction of the wave propagation is proportional to the surface intensity. Iii) an absortion force which is depent upon the complex refractive index of the particle.
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