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Plasmonic optical trap having very large active volume realized with nano-ring structure

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Abstract

The feasibility of using gold nano-rings as plasmonic nano-optical tweezers is investigated. We found that at a resonant wavelength of λ=785nm, the nano-ring produces a maximum trapping potential of 32kBT on gold nanoparticles. The existence of multiple potential wells results in a very large active volume of 106nm3 for trapping the target particles. The report nano-ring design provides an effective approach for manipulating nano-objects in very low concentration into the high-field region and is well suited for integration with microfluidics for lab-on-a-chip applications.

©2012 Optical Society of America

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