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Optical vortices in antiguides

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Abstract

We address the question of whether an optical vortex can be trapped in a dielectric structure with a core of a lower refractive index than the cladding—namely an antiguide. Extensive numerical simulations seem to indicate that this inverse trapping of a vortex is not possible, at least in straightforward implementations. Yet, the interaction of a vortex beam with a curved antiguide produces interesting effects, namely a small but finite displacement of the optical energy center-of-mass and the creation of a symmetrical vortex–antivortex pair on the exterior of the antiguide.

© 2013 Optical Society of America

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