Dresden 2020 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 7: Whispering-Gallery-Mode Resonators

KFM 7.3: Talk

Tuesday, March 17, 2020, 14:40–15:00, TOE 317

Far-field polarization states of 3D-whispering-gallery-mode resonators — •Jakob Kreismann and Martina Hentschel — Technische Universität Ilmenau, Weimarer Straße 25, 98693 Ilmenau, Germany

We investigate the far-field polarization states of whispering gallery modes in three-dimensional optical cone-shaped cavities. In particular, we study how the inclination angle of the cavity wall influences the polarization state of the far field. We show that the far-field lobes separate the helicities of light as a consequence of the spin-orbit coupling of light present in the cavity due to strong transverse confinement. Furthermore, the polarization states depend on the viewing angle, the opening angle of the conical cavity and the axial mode number. This is accompanied by a transition from linear to circular polarization without utilizing anisotropic or inhomogeneous materials.