title: 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.
authors.affiliation: Institute of Modern Optics, Nankai University , Tianjin 300071, China.
authors.forename: Yuquan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.forename: Junfeng
authors.initials: J
authors.lastname: Shen
authors.forename: Zhongsheng
authors.initials: Z
authors.lastname: Man
authors.forename: Wei
authors.initials: W
authors.lastname: Shi
authors.forename: Changjun
authors.initials: C
authors.lastname: Min
authors.forename: Guanghui
authors.initials: G
authors.lastname: Yuan
authors.forename: Siwei
authors.initials: S
authors.lastname: Zhu
authors.forename: H Paul
authors.initials: HP
authors.lastname: Urbach
authors.forename: Xiaocong
authors.initials: X
authors.lastname: Yuan
keywords: Au nanowire; dynamic manipulation; plasmonic hybridization; plasmonic tweezers