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Optical traps and anti-traps for glass nanoplates in hollow waveguides

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Günendi,  Mehmet Can
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Xie,  Shangran
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Novoa,  David
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Russell,  Philip
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Günendi, M. C., Xie, S., Novoa, D., & Russell, P. (2019). Optical traps and anti-traps for glass nanoplates in hollow waveguides. Optics Express, 27(13), 17708-17717. doi:10.1364/OE.27.017708.


Cite as: http://hdl.handle.net/21.11116/0000-0004-620F-E
Abstract
We study theoretically the optical forces acting on glass nanoplates introduced into hollow waveguides, and show that, depending on the sign of the laser detuning relative to the nanoplate resonance, optomechanical back-action between nanoplate and hollow waveguide can create both traps and anti-traps at intensity nodes and anti-nodes in the supermode field profile, behaving similarly to those experienced by cold atoms when the laser frequency is red or blue detuned of an atomic resonance. This arises from dramatic distortions to the mode profile in the hollow waveguide when the nanoplate is off-resonant, producing gradient forces that vary strongly with nanoplate position. In a planar system, we show that when the nanoplate is constrained by an imaginary mechanical spring, its position exhibits strong bistability as the base position is varied. We then treat a two-dimensional system consisting of an anti-resonant nanoplate in the hollow core of a photonic crystal fiber, and predict the stable dark trapping of nanoplate at core center against both translational and rotational motion. The results show that spatial and angular position of nano-scale objects in hollow waveguides can be optically controlled by launching beams with appropriately synthesized transverse field profiles.