The confinement and controlled movement of metal nanoparticles and nanorods is an emergent area within optical micromanipulation. In this letter we experimentally realise a novel trapping geometry near the plasmon resonance using an annular light field possessing a helical phasefront that confines the nanoparticle to the vortex core (dark) region. We interpret our data with a theoretical framework based upon the Maxwell stress tensor formulation to elucidate the total forces upon nanometric particles near the particle plasmon resonance. Rotation of the particle due to orbital angular momentum transfer is observed. This geometry may have several advantages for advanced manipulation of metal nanoparticles.
Optical vortex trap for resonant confinement of metal nanoparticles.
M. Dienerowitz,M. Mazilu,P. Reece,T. Krauss,K. Dholakia
Published 2008 in Optics Express
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PUBLICATION RECORD
- Publication year
2008
- Venue
Optics Express
- Publication date
2008-03-31
- Fields of study
Materials Science, Physics, Medicine, Engineering
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
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