Plasmonic Hybridization Induced Trapping and Manipulation of a Single Au Nanowire on a Metallic Surface

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• 作者：Yuquan Zhang ; Jian Wang ; Junfeng Shen ; Zhongsheng Man ; Wei Shi ; Changjun Min ; Guanghui Yuan ; Siwei Zhu ; H. Paul Urbach ; Xiaocong Yuan
• 刊名：Nano Letters
• 出版年：2014
• 出版时间：November 12, 2014
• 年：2014
• 卷：14
• 期：11
• 页码：6430-6436
• 全文大小：379K
• ISSN：1530-6992

文摘

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.

Keywords:

plasmonic hybridization; plasmonic tweezers; dynamic manipulation; Au nanowire