期刊
NANO LETTERS
卷 18, 期 6, 页码 3637-3642出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b00732
关键词
Optical trapping; optical force; coaxial aperture; gap plasmon; atomic layer lithography; nanogap
类别
资金
- U.S. National Science Foundation [ECCS 1610333]
- NSERC CRD [469469-2014]
- National Institutes of Health Biotechnology Training Grant [NIH T32 GM008347]
- NSF Graduate Research Fellowship Program
- NSF through the National Nanotechnology Coordinated Infrastructure (NNCI)
- Div Of Electrical, Commun & Cyber Sys [1610333] Funding Source: National Science Foundation
We present optical trapping with a 10 nm gap resonant coaxial nanoaperture in a gold film. Large arrays of 600 resonant plasmonic coaxial nanoaperture traps are produced on a single chip via atomic layer lithography with each aperture tuned to match a 785 nm laser source. We show that these single coaxial apertures can act as efficient nanotweezers with a sharp potential well, capable of trapping 30 nm polystyrene nanoparticles and streptavidin molecules with a laser power as low as 4.7 mW. Furthermore, the resonant coaxial nanoaperture enables real-time label-free detection of the trapping events via simple transmission measurements. Our fabrication technique is scalable and reproducible, since the critical nanogap dimension is defined by atomic layer deposition. Thus our platform shows significant potential to push the limit of optical trapping technologies.
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