Journal
NANO LETTERS
Volume 14, Issue 6, Pages 2971-2976Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl404045n
Keywords
Plasmonic antenna; optical tweezer; C-shaped engraving; near-field; handoff; conveyor belt
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Funding
- United States National Science Foundation [1028372]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1028372] Funding Source: National Science Foundation
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Optical tweezers have been widely used to manipulate biological and colloidal material, but the diffraction limit of far-field optics makes focused beams unsuitable for manipulating nanoscale objects with dimensions much smaller than the wavelength of light. While plasmonic structures have recently been successful in trapping nanoscale objects with high positioning accuracy, using such structures for manipulation over longer range has remained a significant challenge. In this work, we introduce a conveyor belt design based on a novel plasmonic structure, the resonant C-shaped engraving (CSE). We show how long-range manipulation is made possible by means of handoff between neighboring CSEs, and we present a simple technique for controlling handoff by rotating the polarization of laser illumination. We experimentally demonstrate handoff between a pair of CSEs for polystyrene spheres 200, 390, and 500 nm in diameter. We then extend this technique and demonstrate controlled particle transport down a 4.5 mu m long nano-optical conveyor belt.
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