We demonstrate a technique for optical manipulation of micron-sized particles, including biological samples, using a zeroth-order Bessel light beam. The central maximum of such a beam offers a "non-diffracting" focal line of light. This line focus is well suited to rotationally align rod-like particles along the beam direction and to build stacks of particles. We have stacked up to nine 5μm spheres above one another and manipulated this particle chain as a whole. Furthermore, we have observed laser guiding (transport) of 1μm particles along the Bessel beam axis over 1 mm, which is over 10 times the Rayleigh range for a comparable Gaussian beam.
Bibliographical noteFunding Information:
We thank the Royal Society, the Leverhulme Trust and the UK Engineering and Physical Sciences Research Council for supporting this work.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering