Selective Trapping or Rotation of Isotropic Dielectric
Microparticles by Optical Near Field in a Plasmonic Archimedes Spiral
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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