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Dual-mode subwavelength trapping by plasmonic tweezers based on V-type nanoantennas

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Abstract

We propose novel plasmonic tweezers based on silver V-type nanoantennas placed on a conducting ground layer, which can effectively mitigate the plasmonic heating effect and thus enable subwavelength plasmonic trapping in the near-infrared region. Using the centroid algorithm to analyze the motion of trapped spheres, we can experimentally extract the value of optical trapping potential. The result confirms that the plasmonic tweezers have a dual-mode subwavelength trapping capability when the incident laser beam is linearly polarized along two orthogonal directions. We have also performed full-wave simulations, which agree with the experimental data very well in terms of spectral response and trapping potential. It is expected that the dual-mode subwavelength trapping can be used in non-contact manipulations of a single nanoscale object, such as a biomolecule or quantum dot, and find important applications in biology, life science, and applied physics.

© 2019 Optical Society of America

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Supplementary Material (2)

NameDescription
Visualization 1       Record motion movie of a 1-µm-diameter polystyrene sphere trapped by a x-polarized 1064 nm laser beam.
Visualization 2       Record motion movie of a 1-µm-diameter polystyrene sphere trapped by a y-polarized 1064 nm laser beam.

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Figures (6)

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