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It is shown that, in the liquid-filled hollow core of a single-mode photoniccrystal fiber, a micron-sized particle can be held stably against a fluidiccounter-flow using radiation pressure, and moved to and fro (over 10s of cm) byramping the laser power up and down. The results represent a major advance overprevious work on particle transport in optically multimode liquid-filledfibers, in which the fluctuating transverse field pattern renders the radiationand trapping forces unpredictable. The counter-flowing liquid can be loadedwith sequences of chemicals in precisely controlled concentrations and doses,making possible studies of single particles, vesicles or cells.

Precise Balancing of Viscous and Radiation Forces on a Particle in Liquid-Filled Photonic Bandgap Fiber