期刊
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
卷 38, 期 5, 页码 1717-1728出版社
Optica Publishing Group
DOI: 10.1364/JOSAB.422731
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- Deutsche Forschungsgemeinschaft [231447078-TRR 142 (C05)]
The study shows that Gaussian-beam-like bundles of semi-guided waves propagating in a dielectric slab can excite modes with high-order optical angular momentum supported by a circular fiber. Through a hybrid simulation, it is predicted that a substantial amount of input power can be focused into waves with specific orbital angular momentum.
Gaussian-beam-like bundles of semi-guided waves propagating in a dielectric slab can excite modes with high-order optical angular momentum supported by a circular fiber. We consider a multimode step-index fiber with a high-index coating, where the waves in the slab are evanescently coupled to the modes of the fiber. Conditions for effective resonant interaction are identified. Based on a hybrid analytical-numerical coupled mode model, our simulations predict that substantial fractions of the input power can be focused into waves with specific orbital angular momentum, of excellent purity, with a clear distinction between degenerate modes with opposite vorticity. (C) 2021 Optical Society of America
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