Abstract

The feasibility of using gold nano-rings as plasmonic nano-optical tweezers is investigated. We found that at a resonant wavelength of $\lambda =785\mathrm{nm}$, the nano-ring produces a maximum trapping potential of $\sim 32k_{B}T$ on gold nanoparticles. The existence of multiple potential wells results in a very large active volume of $\sim {10}^6{\mathrm{nm}}^3$ 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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