Optical trapping forces on biological cells on a waveguide surface
2011
A three dimensional finite element method is used to model the forces acting on red blood cells trapped on
an optical waveguide surface. The parameters are chosen to correspond to strip waveguides made of tantalum
pentoxide (Ta 2 O 5 ). A wavelength of 1070 nm is used and the cells are taken to be spherical. Gradient and
scattering forces experienced by the cells are studied and found to be highly dependent on the refractive index
of the cells. Gradient forces are found to be one order of magnitude larger than scattering forces. Only the lower
part of the cells is in contact with the evanescent field of the waveguide. For low refractive indices, we find that
the lower 0.5-1 μm of the cells is sufficient to determine the optical forces. For the cell sizes considered, all forces
increase with the size.
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