Abstract
We demonstrate the use of a single fiber-optic axicon device for organization of microscopic objects using longitudinal optical binding. Further, by manipulating the shape of the fiber tip, part of the emanating light was made to undergo total internal reflection in the conical tip region, enabling near-field trapping. Near-field trapping resulted in trapping and self-organization of long chains of particles along azimuthal directions (in contrast to the axial direction, observed in the case of large tip cone angle far-field trapping).
Highlights
For fabrication of the axicon tip with varying tip cone angle, a two-step chemical etching using hydrofluoric acid was employed [7]
XY-intensity distribution of the 800 nm beam transmitted through the axicon tip, calculated at two Z distances from the tip, is shown in Figs. 1(a) and 1(b)
In addition to an increase in propagation distance with a decrease in cone angle, transmittance of the beam through the fiber tip decreased substantially, which was attributed to an increase in total internal reflection (TIR) at the tip [10]
Summary
For fabrication of the axicon tip with varying tip cone angle, a two-step chemical etching using hydrofluoric acid was employed [7]. In addition to an increase in propagation distance with a decrease in cone angle (data not shown), transmittance of the beam through the fiber tip decreased substantially, which was attributed to an increase in TIR at the tip [10]. Translation of the fiber in three dimensions led to transportation of the (encircled) optically bound particles (data not shown).
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