Dresden 2026 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 59: Quantum Chaos and Coherent Dynamics (joint session DY/TT)
DY 59.3: Vortrag
Freitag, 13. März 2026, 10:00–10:15, HÜL/S186
How exceptional points conduct mode dynamics in optical microcavities — Tom Simon Rodemund1, Chang-Hwan Yi2, Jung-Wan Ryu2, Síle Nic Chormaic3, and •Martina Hentschel1 — 1Institut für Physik, TU Chemnitz, Germany — 2PCS, IBS, Daejeon, Korea — 3OIST, Okinawa, Japan
Optical microcavities confine light through total internal reflection, making them inherently open, non-Hermitian systems. Their resonances have a real and an imaginary part, both of which depend on external parameters such as the resonator geometry or the refractive index. When scanning the parameter space, resonances can coincide and when they do so in their real and imaginary part, they form an exceptional point. We illustrate their occurrence and consequences in mesoscopic optics in two examples. First, we consider two coupled two-dimensional microcavities over coupling distances of several resonance wavelengths. Their mode dynamics is determined by a chain of exceptional points that exhibit a periodicity of approximately the wavelength [1]. The second example is a three-dimensional truncated cone. We investigate the interaction between the two mode polarizations, TE and TM, and find that the mode character changes smoothly, with TE and TM coinciding at exceptional points [2]. We confirm this behavior in phase space by generalizing the concept of Husimi functions to three dimensions. [1] C.-H. Yi, J.-W. Ryu, T.S. Rodemund, and M. Hentschel, Phys. Rev. A 112, L031501 (2025). [2] T.S. Rodemund, S. Li, S. Nic Chormaic, and M. Hentschel, Phys. Rev. A 112, 033528 (2025).
Keywords: Exceptional Points; Non-Hermitian microcavities; mesoscopic optics; coupling; 3d Husimi functions