Optically pulling a particle towards a light source may be counterintuitive, but it is not impossible. Jack Ng tells Nature Photonics how this force can be achieved.
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Won, R. Optical attraction. Nature Photon 5, 566 (2011). https://doi.org/10.1038/nphoton.2011.205
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DOI: https://doi.org/10.1038/nphoton.2011.205