Exceptional points in a dielectric spheroid
Bulgakov, E; Pichugin, K and Sadreev, A/ PHYSICAL REVIEW A/
DOI:https://doi.org/10.1103/PhysRevA.104.053507
Evolution of resonant frequencies and resonant modes as dependent on the aspect ratio is considered in a dielectric high index spheroid. Because of rotational symmetry of the spheroid the solutions are separated by the azimuthal index m. By the two-parametric variation of a refractive index and the aspect ratio we achieve exceptional points at which the resonant frequencies and resonant modes are coalesced in the sector m=0.