Plasmonic particles set into fast orbital motion by an optical vortex beam

Lehmuskero, AnniDepartment of Applied Physics, Chalmers University of Technology, Gothenburg, Sweden (author)

Sponsors:Goran Gustafsson Foundation Swedish Research Council Chalmers Nanoscience Area of Advance Emil Aaltonen Foundation National Science Foundation (NSF) Grant(s): 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 ħl per photon.

Li, YanmingElectrical & Computer Engineering Department, NC State University, Raleigh, North Carolina, USA (author)
Johansson, Peter,1961-Örebro universitet,Institutionen för naturvetenskap och teknik,School of Science and Technology, Örebro University, Örebro, Sweden(Swepub:oru)pejn (author)
Johansson, Mikael (author)
Department of Applied Physics, Chalmers University of Technology, Gothenburg, SwedenElectrical & Computer Engineering Department, NC State University, Raleigh, North Carolina, USA (creator_code:org_t)

By the author/editor: Lehmuskero, Anni; Li, Yanming; Johansson, Peter ...; Johansson, Mikae ...

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