Regensburg 2019 – scientific programme

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DS: Fachverband Dünne Schichten

DS 7: Optical Analysis of Thin Films II (Reflection, Ellipsometry, Raman, IR-DUV Spectroscopy, ...

DS 7.1: Talk

Monday, April 1, 2019, 15:00–15:15, H32

Topology Related Phenomena in Anisotropic Organic Microcavities — •Ota Kunt, Markas Sudzius, Hartmut Fröb, and Karl Leo — Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP), Dresden, Germany

We investigate planar microcavities consisting of two dielectric Bragg reflectors and an optically anisotropic uniaxial cavity layer with its optical axis tilted with respect to the growth direction of the structure. The optical properties of these devices are thoroughly investigated by angular and polarization resolved spectroscopic measurements and simulated using transfer matrix technique, which is extended to account for the optical anisotropy. Both experiment and simulations show polarization splitting of the cavity modes due to anisotropy. The modes are in general elliptically polarized, non-orthogonal and differ in both energy and spectral broadening. Points in the photon in-plane momentum space are found where the modes coalesce in both energy and energy broadening, are circularly polarized and are cores of polarization vortices. These points represent non-Hermitian degeneracies or exceptional points of a non-Hermitian system. We investigate in detail the analogy between the system’s optical response and that of a biaxial absorbing crystal and investigate the influence of organic gain material in the cavity.