Plasmonic hybridization induced trapping and manipulation of a single Au nanowire on a metallic surface.

Abstract

Hybridization in the narrow gaps between the surface plasmon polaritons (SPPs) along a metal surface and the localized surface plasmons on metallic nano-objects strongly enhance the electromagnetic field. Here, we employ plasmonic hybridization to achieve dynamic trapping and manipulation of a single metallic nanowire on a flat metal surface. We reveal that the plasmonic hybridization achieved by exciting plasmonic tweezers with a linearly polarized laser beam could induce strong trapping forces and large rotational torques on a single metallic nanowire. The position and orientation of the nanowire could dynamically be controlled by the hybridization-enhanced nonisotropic electric field in the gap. Experimental results further verify that a single Au nanowire could robustly be trapped at the center of an excited SPP field by the induced forces and then rotated by the torques. Finally, a plasmonic swallow tail structure is built to demonstrate its potential in the fabrication of lab-on-a-chip plasmonic devices.

DOI: 10.1021/nl502975k

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Cite this paper

@article{Zhang2014PlasmonicHI, title={Plasmonic hybridization induced trapping and manipulation of a single Au nanowire on a metallic surface.}, author={Yuquan Zhang and Jian Wang and Junfeng Shen and Zhongsheng Man and Wei Shi and Changjun Min and Guanghui Yuan and Siwei Zhu and H Paul Urbach and Xiaocong Yuan}, journal={Nano letters}, year={2014}, volume={14 11}, pages={6430-6} }