English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Chaotic whispering-gallery modes have significance both for opticalapplications and for our understanding of the interplay between wave phenomenaand the classical ray limit in the presence of chaotic dynamics and openness.In strongly non-convex geometries, a theorem by Mather rules out the existenceof invariant curves in phase space corresponding to rays circulating inwhispering-gallery patterns, so that no corresponding modes of this type areexpected. Here we discuss numerical computations of the electromagnetic fieldsin planar dielectric cavities that are strongly non-convex becausethey arecoupled to waveguides. We find a family of special states which retains manyfeatures of the chaotic whispering-gallery modes known from convex shapes: anintensity pattern corresponding to near-grazing incidence along extended partsof the boundary, and comparatively high cavity Q factors. The modes are foldedinto a figure-eight pattern, so overlap with the boundary is reduced in theregion of self-intersection. The modes combine the phenomenology of chaoticwhispering-gallery modes with an important technological advantage: the abilityto directly attach waveguides without spoiling the Q factor of the folded mode.Using both a boundary-integral method and the FDTD technique, we explore thedependence of the phenomenon on wavelength in relation to cavity size,refractive-index contrast to the surrounding medium, and the degree of shapedeformation. A novel feature that distinguishes folded from regular whisperinggallery modes is that a given shape will support high-Q folded chaoticwhispering gallery modes only in certain wavelength windows.

Folded chaotic whispering-gallery modes in non-convex, waveguide-coupled planar optical microresonators