Optical trapping with a perfect vortex beam
TL;DR: In this article, the authors used an annular illuminating beam with a xed intensity prole on an SLM that imposes a chosen topological charge to create a perfect vortex beam.
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Abstract: Vortex beams with dierent topological charge usually have dierent proles and radii of peak intensity. This introduces a degree of complexity the fair study of the nature of optical OAM (orbital angular momentum). To avoid this, we introduced a new approach by creating a perfect vortex beam using an annular illuminating beam with a xed intensity prole on an SLM that imposes a chosen topological charge. The radial intensity prole of such an experimentally created perfect vortex beam is independent to any given integer value of its topological charge. The well-dened OAM density in such a perfect vortex beam is probed by trapping microscope particles. The rotation rate of a trapped necklace of particles is measured for both integer and non-integer topological charge. Experimental results agree with the theoretical prediction. With the exibility of our approach, local OAM density can be corrected in situ to overcome the problem of trapping the particle in the intensity hotspots. The correction of local OAM density in the perfect vortex beam therefore enables a single trapped particle to move along the vortex ring at a constant angular velocity that is independent of the azimuthal position. Due to its particular nature, the perfect vortex beam may be applied to other studies in optical trapping of particles, atoms or quantum gases.
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Citations
Diffractive optics for combined spatial- and mode- division demultiplexing of optical vortices: design, fabrication and optical characterization
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Rotating of low-refractive-index microparticles with a quasi-perfect optical vortex.
TL;DR: Experimental results showed that the quasi-POV was preferable for manipulation of large-sized low-refractive-index microparticles, with its control of the particles' rotating velocity dependent only on the topological charge due to the unchanged orbital radius.
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Non-collinear interaction of photons with orbital angular momentum
TL;DR: The results have implications beyond the specific case studied here of second-harmonic generation, in particular for parametric down-conversion of photons or in general for phase-matched non-collinear interactions between beams with different OAM.
A High-Gain Transmitarray for Generating Dual-Mode OAM Beams
TL;DR: Main advantages of the proposed transmitarray antenna include high gain, narrow divergence angle, low cost, planar structure, and the capability of producing dual-mode OAM beams.
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OAM light propagation through tissue.
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