Abstract
Higher order Bessel, Airy and Laguerre-Gaussian beams have recently been used to manipulate micrometer-sized objects in free space [1]. Here we use a coherent superposition of the two lowest order forward-propagating modes of a soft glass hollow-core photonic crystal fiber (HC-PCF, Fig. 1a) to control the axial and radial trapping position of particles inside the core. Because each fiber mode propagates at a different phase velocity, the transverse intensity distribution varies periodically along the propagation direction (Fig. 1b). A counter-propagating fundamental mode (FM) is then used to create a series of trapping positions along the fiber. The trapping sites are slightly off-axis, spaced by half the intermodal beat length LB, and can be moved simply by changing the phase Δφ between the two forward-propagating modes.
© 2013 IEEE
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