Abstract
The complete picture of the optical properties of resonant structures, along with the frequency, quality factor, and line shape in scattering spectra, is determined by the electromagnetic field distribution patterns, which are a kind of “fingerprint” of each resonant eigenmode. In this paper, we simultaneously analyze the changes in the spectra and the transformation of the field pattern during topological transitions from a thin disk to a ring with a gradually increasing thickness and further to a split ring. In addition, we demonstrate characteristic optical fingerprints for well-known interference effects such as bound states in the continuum and Fano resonances.
Funder
Ministry of Science and Higher Education of the Russian Federation
Russian Science Foundation
Foundation for the Advancement of Theoretical Physics and Mathematics
Subject
Atomic and Molecular Physics, and Optics,Statistical and Nonlinear Physics