Fig. 4.
(Color online) (a) Axial and (b) radial trapping forces exerted on a 7.8 µm diameter polystyrene sphere calculated for fiber separations ranging from 110–310 µm. For these simulations, the center of the stretcher is held fixed (at an axial position of 25 µm and a radial position of 0 µm) in the center of a glass capillary tube.