
1.Max Planck Institute for the Science of Light, Staudtstr. 2, 91058 Erlangen, Germany
2.Department of Physics, University of Erlangen-Nuremberg, 91058 Erlangen, Germany
3.NanoPhotonics Centre, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK
Shangran Xie (shangran.xie@mpl.mpg.de)
Published:2018,
Published Online:20 June 2018,
Received:25 October 2017,
Revised:09 March 2018,
Accepted:09 March 2018
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Bykov, D. S. et al. Long-range optical trapping and binding of microparticles in hollow-core photonic crystal fibre. Light: Science & Applications, 4, 147-153 (2018).
Bykov, D. S. et al. Long-range optical trapping and binding of microparticles in hollow-core photonic crystal fibre. Light: Science & Applications, 4, 147-153 (2018). DOI: 10.1038/s41377-018-0015-z.
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 levitated microparticles
mediated by intermodal scattering and interference inside the evacuated core of a hollow-core photonic crystal fibre (HC-PCF). Three polystyrene particles with a diameter of 1 µm are stably bound together with an inter-particle distance of ~40 μm
or 50 times longer than the wavelength of the trapping laser. The levitated bound-particle array can be translated to-and-fro over centimetre distances along the fibre. When evacuated to a gas pressure of 6 mbar
the collective mechanical modes of the bound-particle array are able to be observed. The measured inter-particle distance at equilibrium and mechanical eigenfrequencies 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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