Fig. 3: Geodesic mode coupling and non-Hermitian EP.
From: Manipulating cavity photon dynamics by topologically curved space
a Mode frequencies as a function of k, showing anti-crossing features at each resonant point. b The Q-factor of mode a as a function of k. c, d The splittings of the real (c) and imaginary (d) parts of the eigenvalues of the hybrid modes formed by the coupling between modes a and d, as a function of the material refractive index n. e The electric field distributions (top view) of the corresponding points a1, a2, b1, b2 and c1, c2 in c and d. The degenerate points b1 and b2 correspond to the EP. Note here the letters a1 to c2 are used to label the points in this figure and are not associated with the labeling of different modes
