Abstract
We demonstrate the transfer of orbital angular momentum from a light beam to a trapped low-index particle.. The particle is trapped in a dark annular region of a high-order Bessel beam and rotates around the beam axis due to scattering from the helical wave fronts of the light beam. A general theoretical geometrical optics model. is developed that, applied to our specific situation, corroborates tweezing and transfer of orbital angular momentum to the low-index particle. Good quantitative agreement between theory and experiment for particle rotation rates is observed.
Original language | English |
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Article number | 063402 |
Number of pages | 8 |
Journal | Physical Review. A, Atomic, molecular, and optical physics |
Volume | 66 |
Issue number | 6 |
DOIs | |
Publication status | Published - Dec 2002 |
Keywords
- HORIZONTAL LASER-BEAMS
- DIELECTRIC SPHERE
- FORCE
- LIGHT
- LEVITATION
- VORTEX
- MICROPARTICLES
- SPANNER
- SPIN