Complex modes in optical fibers and silicon waveguides

Article Optics

Slow light mediated by mode topological transitions in hyperbolic waveguides

Pilar Pujol-Closa et al.

Summary: In symmetric planar structures with type II films, slow light in hyperbolic waveguides is associated with topological transitions in the dispersion diagram as film thickness changes, mediated by the coalescence of elliptical mode branches and anomalously ordered hyperbolic mode branches. This transition leads to the formation of a saddle point that transforms into a branch point with slow light characteristics and the appearance of ghost waves for a broad range of film thicknesses.

OPTICS LETTERS (2021)

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Article Optics

Ghost-induced exact degeneracies

Sanjay Debnath et al.

Summary: Ghost waves, a special class of nonuniform waves in biaxial dielectric media, can lead to exact frequency degeneracies in guided modes, offering a new way of controlling mode interactions with a broad range of potential applications, from integrated wave-guides to nonlinear optics and optical sensing.

OPTICS LETTERS (2021)

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Article Optics