Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 79: Quantum Chaos and Coherent Dynamics (joint session DY/TT)
TT 79.7: Vortrag
Donnerstag, 21. März 2024, 16:45–17:00, A 151
Non-Hermitian mesoscopic optics in coupled microcavities — •Tom Rodemund1, Síle Nic Chormaic2, and Martina Hentschel1 — 1Institute of Physics, Chemnitz University of Technology, Chemnitz, Germany — 2Okinawa Institute of Science and Technology Graduate University, Okinawa, Japan
Coupled cavities are of interest as they expose qualitatively new effects, such as non-Hermitian properties, that are not accessible using an individual cavity. Here, we study two coupled two-dimensional microdisk cavities of circular and deformed (limaçon) shape, which are in the focus of interest due to their high emission directionality [1].
We investigate their coupling-induced properties as a function of intercavity distance and identify characteristic coupling regimes, with clear signatures of the presence of another cavity even deep in the weak couling regime. For deformed coupled microcavities, the asymmetry of the intercavity coupling implies non-Hermitian properties prominently evident in the chirality of the coupled cavity modes. We use an analytical model to explain our findings and reveal the direct connection between coupling asymmetry and the resulting sense of rotation of the coupled modes. This could prove useful for future applications such as far-field emission control of coupled cavities.
[1] Kreismann et al., Phys. Rev. Res. 1 033171 (2019)
Keywords: optical microcavity; coupled microcavities; chirality; phase-space analysis; non-Hermitian