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Opt Lett. 2012 Jan 1;37(1):91-3. doi: 10.1364/OL.37.000091.

Metrology of laser-guided particles in air-filled hollow-core photonic crystal fiber.

Author information

  • 1Max Planck Institute for the Science of Light, Guenther-Scharowsky-Strasse 1/Bau 24, 91058 Erlangen, Germany. oliver.schmidt@mpl.mpg.de


Micrometer-sized particles are trapped in front of an air-filled hollow-core photonic crystal fiber using a novel dual-beam trap. A backward guided mode produces a divergent beam that diffracts out of the core, and simultaneously a focused laser beam launches a forward-propagating mode into the core. By changing the backward/forward power balance, a trapped particle can be selectively launched into the hollow core. Once inside, particles can be optically propelled along several meters of fiber with mobilities as high as 19 cm·s(-1) W(-1) (precisely measured using in-fiber Doppler velocimetry). The results are in excellent agreement with theory. The system allows determination of fiber loss as well as the mass density and refractive index of single particles.

© 2012 Optical Society of America

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