We present a method for the controlled alignment or rotation of birefringent particles trapped in multiple optical trap sites of an interference pattern between two Laguerre—Gaussian laser modes. Controlled spin or alignment of the particles within each individual trap site is achieved independently of the lateral or rotational motion of the interference pattern as a whole. This technique may lead to driving arrays of micro-machines and micro-fluidic studies and can be used in combination with dynamically generated trapping arrays for uniformly distributed stirring throughout microscopic volumes of fluid.
Bibliographical noteFunding Information:
The authors would like to thank the UK Engineering and Physical Science Research Council (EPSRC),the Medical Research Council (MRC) and the Royal Society Paul Instrument Fund for their support.
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics