Journal
OPTICS EXPRESS
Volume 22, Issue 22, Pages 26840-26849Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.026834
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Funding
- National Science Foundation [DMR-1305875]
- NASA
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1305875] Funding Source: National Science Foundation
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Optical conveyors are active tractor beams that selectively transport illuminated objects either upstream or downstream along their axes. Formed by the coherent superposition of coaxial Bessel beams, an optical conveyor features an axial array of equally spaced intensity maxima that act as optical traps for small objects. We demonstrate through measurements on colloidal spheres and numerical calculations based on the generalized Lorenz-Mie theory that optical conveyors' interferometric structure endows them with trapping characteristics far superior to those of conventional optical tweezers. Optical conveyors form substantially stiffer traps and can transport a wider variety of materials over a much longer axial range. (C) 2014 Optical Society of America
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