期刊
OPTICS EXPRESS
卷 22, 期 4, 页码 4349-4356出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.22.004349
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资金
- Goran Gustafsson Foundation
- Swedish Research Council
- Chalmers Nanoscience Area of Advance
- Emil Aaltonen Foundation
- National Science Foundation (NSF) [ECCS-0955127]
We optically trap plasmonic gold particles in two dimensions and set them into circular motion around the optical axis using a helically phased vortex laser beam. The orbiting frequency of the particles reaches 86 Hz, which corresponds to a particle velocity of the order 1 mm per second, for an incident laser power of a few tens of milliwatts. The experimentally determined orbiting frequencies are found to be well in line with the notion that the beam carries an orbital angular momentum of hl per photon. (C) 2014 Optical Society of America
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