Selective trapping or rotation of isotropic dielectric microparticles by optical near field in a plasmonic archimedes spiral.
basic_science · Level V
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- Record sourced from PubMed, PMID 24392638.
- Also identified by DOI 10.1021/nl403608a.
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Abstract
We demonstrate selective trapping or rotation of optically isotropic dielectric microparticles by plasmonic near field in a single gold plasmonic Archimedes spiral. Depending on the handedness of circularly polarized excitation, plasmonic near fields can be selectively engineered into either a focusing spot for particle trapping or a plasmonic vortex for particle rotation. Our design provides a simple solution for subwavelength optical manipulation and may find applications in micromechanical and microfluidic systems.