期刊
NANO LETTERS
卷 12, 期 10, 页码 5155-5161出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl302100n
关键词
Optical tweezers; optical manipulation; plasmonics; metal nanowires
类别
资金
- U.S. Department of Energy (DOE), Office of Science, Division of Chemical, Geological and Biological Sciences [DE-AC02-06CH11357]
- National Science Foundation [CHE-0802913]
- U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1059057] Funding Source: National Science Foundation
We report the first experimental realization of all-optical trapping and manipulation of plasmonic nanowires in three dimensions. The optical beam used for trapping is the Fourier transform of a linearly polarized Bessel beam (termed FT-Bessel). The extended depth of focus of this beam enables the use of a retroreflection geometry to cancel radiation pressure in the beam propagation direction, making it possible to trap highly scattering and absorbing silver nanowires. Individual silver nanowires with lengths of several micrometers can be positioned by the trapping beam with a precision better than 100 nm and are oriented by the polarization of the trapping light with a precision of approximately 1 degrees. Multiple nanowires can be trapped simultaneously in spatially separated maxima of the trapping field. Since trapping in the interferometric FT-Bessel potential is robust in bulk solution and near surfaces, it will enable the controlled assembly of metal nanowires into plasmonic nanostructures.
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