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3D Optical Vortex Trapping of Plasmonic Nanostructure.

ABSTRACT: 3D optical vortex trapping upon a polystyrene nanoparticle (NP) by a 1D gold dimer array is studied theoretically. The optical force field shows that the trapping mode can be contact or non-contact. For the former, the NP is attracted toward a corresponding dimer. For the latter, it is trapped toward a stagnation point of zero force with a 3D spiral trajectory, revealing optical vortex. Additionally the optical torque causes the NP to transversely spin, even though the system is irradiated by a linearly polarized light. The transverse spin-orbit interaction is manifested from the opposite helicities of the spin and spiral orbit. Along with the growth and decline of optical vortices the trapped NP performs a step-like motion, as the array continuously moves. Our results, in agreement with the previous experiment, identify the role of optical vortex in the near-field trapping of plasmonic nanostructure.

SUBMITTER: Liaw JW

PROVIDER: S-EPMC6107535 | biostudies-literature | 2018 Aug

REPOSITORIES: biostudies-literature

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3D Optical Vortex Trapping of Plasmonic Nanostructure.

Liaw Jiunn-Woei JW Chien Chiao-Wei CW Liu Kun-Chi KC Ku Yun-Cheng YC Kuo Mao-Kuen MK

Scientific reports 20180823 1

3D optical vortex trapping upon a polystyrene nanoparticle (NP) by a 1D gold dimer array is studied theoretically. The optical force field shows that the trapping mode can be contact or non-contact. For the former, the NP is attracted toward a corresponding dimer. For the latter, it is trapped toward a stagnation point of zero force with a 3D spiral trajectory, revealing optical vortex. Additionally the optical torque causes the NP to transversely spin, even though the system is irradiated by a ...[more]

PMID: 30140032

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