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Proceedings Paper

Manipulating forces in optical vortex using plasmonic bumps
Author(s): E. H. Khoo; I. Ahmed; M. T. W. Ang; E. P. Li
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Paper Abstract

In this paper, small plasmonic nanobumps, which consist of metal/dielectric layers are placed on the ring of optical vortex to enhance electric field ampltiude. In this paper, a plasmonic nanobump is placed on the ring of smaller optical vortex. The smaller optical vortex form from the resultant topological phase between the handedness of the incident circular polarized light and the nanoslits spiral. Different designs of plasmonic nanobump are investigated, and tapered nanobump produced higher field enhancement due to higher surface charge density at the tapering end. Higher field intensity at the tip of the plasmonic nanobump produces lower potential, which attract nanoparticle to the region. The optical force increases by the square of the electric field amplitude. This high electric field intensity at the plasmonic nanobump functions as attractive node, which trap molecules inside the optical vortex. Additional plasmonic nanobumps are added onto the other locations of the optical vortex to manipulate the particle trapping positions. This allows the precise control of molecule’s position and movement for imaging, characterization and analysis, which is useful for mobile lab-on-chip devices.

Paper Details

Date Published: 10 October 2012
PDF: 9 pages
Proc. SPIE 8458, Optical Trapping and Optical Micromanipulation IX, 84581U (10 October 2012); doi: 10.1117/12.929330
Show Author Affiliations
E. H. Khoo, A*STAR Institute of High Performance Computing (Singapore)
I. Ahmed, A*STAR Institute of High Performance Computing (Singapore)
M. T. W. Ang, A*STAR Institute of High Performance Computing (Singapore)
E. P. Li, A*STAR Institute of High Performance Computing (Singapore)


Published in SPIE Proceedings Vol. 8458:
Optical Trapping and Optical Micromanipulation IX
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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