Journal
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Volume 34, Issue 6, Pages C14-C19Publisher
OPTICAL SOC AMER
DOI: 10.1364/JOSAB.34.000C14
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Funding
- Engineering and Physical Sciences Research Council (EPSRC) [EP/J01771X/1, EP/M000869/1]
- EPSRC [EP/M000869/1, EP/J01771X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/M000869/1, EP/J01771X/1] Funding Source: researchfish
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We trap a single silica microparticle in a complex three-dimensional optical potential with orbital angular momentum in vacuum. The potential is formed by the generation of a perfect vortex in vacuum which, upon propagation, evolves to a Bessel light field. The optical gradient and scattering forces interplay with the inertial and gravitational forces acting on the trapped particle to produce a rich variety of orbital motions with respect to the propagation axis. As a result, the particle undergoes a complex trajectory, part of which is rotational motion in the plane of the perfect vortex. As the particle explores the whole three-dimensional volume and is not solely restricted to one anchor point, we are able to determine the three-dimensional optical potential in situ by tracking the particle. This represents the first demonstration of trapping a microparticle within a complex three-dimensional optical potential in vacuum. This may open up new perspectives in levitated optomechanics with particle dynamics on complex trajectories. (C) 2017 Optical Society of America.
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