Optical vortex trap for resonant confinement of metal nanoparticles

Maria Dienerowitz, Michael Mazilu, Peter Reece, Thomas Fraser Krauss, Kishan Dholakia

Research output: Contribution to journalArticlepeer-review

219 Citations (Scopus)

Abstract

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. (C) 2008 Optical Society of America.

Original languageEnglish
Pages (from-to)4991-4999
Number of pages9
JournalOptics Express
Volume16
Issue number7
DOIs
Publication statusPublished - 31 Mar 2008

Keywords

  • ORBITAL ANGULAR-MOMENTUM
  • GAUSSIAN LASER MODES
  • GOLD NANOPARTICLES
  • RADIATION PRESSURE
  • PARTICLES
  • SINGLE
  • SPECTROSCOPY
  • FORCES
  • ATOMS
  • LIGHT

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