Roy, Basudev ; Ghosh, Nirmalya ; Dutta Gupta, S. ; Panigrahi, Prasanta K. ; Roy, Soumyajit ; Banerjee, Ayan (2013) Controlled transportation of mesoscopic particles by enhanced spin-orbit interaction of light in an optical trap Physical Review A, 87 (4). ISSN 1050-2947 (In Press)
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Official URL: http://doi.org/10.1103/PhysRevA.87.043823
Related URL: http://dx.doi.org/10.1103/PhysRevA.87.043823
Abstract
We study the effects of the spin orbit interaction (SOI) of light in an optical trap and show that the propagation of the tightly focused trapping beam in a stratified medium can lead to significantly enhanced SOI. For a plane polarized incident beam the SOI manifests itself by giving rise to a strong anisotropic linear diattenuation effect which produces polarization-dependent off-axis high intensity side lobes near the focal plane of the trap. Single micron-sized asymmetric particles can be trapped in the side lobes, and transported over circular paths by a rotation of the plane of input polarization. We demonstrate such controlled motion on single pea-pod shaped single soft oxometalate (SOM) particles of dimension around $1\times 0.5\mu$m over lengths up to $\sim$15 $\mu$m . The observed effects are supported by calculations of the intensity profiles based on a variation of the Debye-Wolf approach. The enhanced SOI could thus be used as a generic means of transporting mesoscopic asymmetric particles in an optical trap without the use of complex optical beams or changing the alignment of the beam into the trap.
Item Type: | Article |
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Source: | Copyright of this article belongs to ResearchGate GmbH. |
ID Code: | 127915 |
Deposited On: | 14 Oct 2022 11:35 |
Last Modified: | 14 Oct 2022 11:35 |
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