List of Division publications with links

2012-06-01 09:26 - Reconfigurable optothermal microparticle trap in air-filled hollow-core photonic crystal fiber

O. A. Schmidt, M. K. Garbos, T. G. Euser, and P. St. J. Russell, Phys. Rev. Lett. 109, 024502 (2012)

We report a novel optothermal trapping mechanism that occurs in air-filled hollow-core photonic crystal fiber. In the confined environment of the core, the motion of a laser-guided particle is strongly influenced by the thermal-gradient-driven flow of air along the core surface. Known as "thermal creep flow", this can be induced either statically by local heating, or dynamically by the absorption (at a black mark placed on the fiber surface) of light scattered by the moving particle. The optothermal force on the particle, which can be accurately measured in hollow-core fiber by balancing it against the radiation forces, turns out to exceed the conventional thermophoretic force by two orders of magnitude. The system makes it possible to measure pN-scale forces accurately and to explore thermally-driven flow in micron-scale structures.


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