Nano-optical trapping using an all-dielectric optical fiber supporting a TEM-like mode

Fiber optical tweezers benefit from compact structures and compatibility with fiber optic technology, however, trapping of nano-objects are rarely demonstrated. Here, we predict stable optical trapping of a 30 nm polystyrene particle using an all-dielectric coaxial optical fiber supporting an axisym...

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Bibliographic Details
Published in:Nanotechnology 2022-01, Vol.33 (4), p.45201
Main Authors: Lou, Yuanhao, Wan, Xinchen, Pang, Yuanjie
Format: Article
Language:English
Subjects:
coaxial optical fiber
fiber optical tweezers
TEM-like mode
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Summary:Fiber optical tweezers benefit from compact structures and compatibility with fiber optic technology, however, trapping of nano-objects are rarely demonstrated. Here, we predict stable optical trapping of a 30 nm polystyrene particle using an all-dielectric coaxial optical fiber supporting an axisymmetric TEM-like mode. We demonstrate, via comprehensive finite-difference time-domain simulations, that the trapping behavior arises from a significant shift of the fiber-end-fire radiation directivity originated from the nanoparticle-induced symmetry breaking, rather than the gradient force which assumes an invariant optical field. Fabrication of the fiber involved is entirely feasible with existing techniques, such as thermal-drawn and electrospinning, and therefore can be mass-produced.
ISSN:0957-4484
1361-6528
DOI:10.1088/1361-6528/ac2766