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arXiv · 1709.04053

Long-range optical trapping and binding of microparticles in hollow-core photonic crystal fibre

Dmitry S. Bykov·Shangran Xie·Richard Zeltner·Andrey Machnev·Gordon K. L. Wong·Tijmen G. Euser·Philip St. J. Russell
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Abstract

Optically levitated micro- and nanoparticles offer an ideal playground for investigating photon-phonon interactions over macroscopic distances. Here we report the observation of long-range optical binding of multiple microparticles, mediated by intermodal scattering and interference inside the evacuated core of a hollow-core photonic crystal fibre (HC-PCF). Three polystyrene particles with 1 {\mu}m diameter are stably bound together with an inter-particle distance of ~40 {\mu}m, or 50 times longer than the wavelength of the trapping laser. The bound-particle array can be translated to-and-fro over centimetre distances along the fibre. When evacuated to 6 mbar gas pressure, the collective mechanical modes of the bound-particle array could be observed. The measured inter-particle distance at equilibrium and mechanical eigen-frequencies are supported by a novel analytical formalism modelling the dynamics of the binding process. The HC-PCF system offers a unique platform for investigating the rich optomechanical dynamics of arrays of levitated particles in a well-isolated and protected environment.

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Dmitry S. Bykov, Shangran Xie, Richard Zeltner, Andrey Machnev, Gordon K. L. Wong, Tijmen G. Euser, Philip St. J. Russell. 2017-09-12. Long-range optical trapping and binding of microparticles in hollow-core photonic crystal fibre. https://arxiv.org/abs/1709.04053

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