Low-power nano-optical vortex trapping via plasmonic diabolo nanoantennas

Ju-Hyung Kang, Kipom Kim, Ho-Seok Ee, Yong-Hee Lee, Tae-Young Yoon, Min-Kyo Seo () and Hong-Gyu Park ()
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Ju-Hyung Kang: Korea University
Kipom Kim: KAIST
Ho-Seok Ee: Korea University
Yong-Hee Lee: KAIST
Tae-Young Yoon: KAIST
Min-Kyo Seo: KAIST
Hong-Gyu Park: Korea University

Nature Communications, 2011, vol. 2, issue 1, 1-6

Abstract: Abstract Optical vortex trapping can allow the capture and manipulation of micro- and nanometre-sized objects such as damageable biological particles or particles with a refractive index lower than the surrounding material. However, the quest for nanometric optical vortex trapping that overcomes the diffraction limit remains. Here we demonstrate the first experimental implementation of low-power nano-optical vortex trapping using plasmonic resonance in gold diabolo nanoantennas. The vortex trapping potential was formed with a minimum at 170 nm from the central local maximum, and allowed polystyrene nanoparticles in water to be trapped strongly at the boundary of the nanoantenna. Furthermore, a large radial trapping stiffness, ~0.69 pN nm−1 W−1, was measured at the position of the minimum potential, showing good agreement with numerical simulations. This subwavelength-scale nanoantenna system capable of low-power trapping represents a significant step toward versatile, efficient nano-optical manipulations in lab-on-a-chip devices.

Date: 2011
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DOI: 10.1038/ncomms1592

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