Abstract
We propose the use of a multiple-beam optical tweezer (MOT) system for the formation and active manipulation of an assembly of micro- and nano-scale particles. This method enables the study of arrays of particles for practical applications in all-optical control of an array of pumps, switches and valves for micro-fluidic processes, bio-chemical sensing or lab-on-a-chip devices and guided assembly of colloidal structures to form photonic crystals. A fully dynamic MOT system is constructed using the generalized phase contrast (GPC) method and a phase-only spatial light modulator (SLM). The GPC method enables loss-less light projection and direct transformation of an input phase pattern to an array of high-intensity beams. This straightforward process enables an adjustable number of traps and instantaneous control of the position, size, shape and intensity of each trapping-beam by encoding the appropriate phase pattern on the SLM. We present experimental results showing trapping and dynamic manipulation of multiple micro-spheres in a liquid solution.
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