Exceptional points are degeneracies in the spectrum of non-Hermitian open systems where at least two eigenfrequencies and simultaneously the corresponding eigenstates of the Hamiltonian coalesce. Especially, the robust construction of higher-order exceptional points with more than two degenerate eigenfrequencies and eigenstates is challenging but yet worthwhile for applications. In this paper, we reconsider the formation of higher-order exceptional points through waveguide-coupled microring cavities and asymmetric backscattering. In this context, we demonstrate the influence of perturbations on the frequency splitting of the system. To generate higher-order exceptional points in a simple and robust way, a mirror-induced asymmetric backscattering approach is used. In addition to the exceptional-point enhanced sensing capabilities of such systems, also a cavity-selective sensitivity is achieved for particle sensing. The results are motivated by an effective Hamiltonian description and verified by full numerical simulations of the dielectric structure.
%0 Journal Article
%1 Kullig:23
%A Kullig, Julius
%A Grom, Daniel
%A Klembt, Sebastian
%A Wiersig, Jan
%D 2023
%I Optica Publishing Group
%J Photon. Res.
%K c
%N 10
%P A54--A64
%R 10.1364/PRJ.496414
%T Higher-order exceptional points in waveguide-coupled microcavities: perturbation induced frequency splitting and mode patterns
%U https://opg.optica.org/prj/abstract.cfm?URI=prj-11-10-A54
%V 11
%X Exceptional points are degeneracies in the spectrum of non-Hermitian open systems where at least two eigenfrequencies and simultaneously the corresponding eigenstates of the Hamiltonian coalesce. Especially, the robust construction of higher-order exceptional points with more than two degenerate eigenfrequencies and eigenstates is challenging but yet worthwhile for applications. In this paper, we reconsider the formation of higher-order exceptional points through waveguide-coupled microring cavities and asymmetric backscattering. In this context, we demonstrate the influence of perturbations on the frequency splitting of the system. To generate higher-order exceptional points in a simple and robust way, a mirror-induced asymmetric backscattering approach is used. In addition to the exceptional-point enhanced sensing capabilities of such systems, also a cavity-selective sensitivity is achieved for particle sensing. The results are motivated by an effective Hamiltonian description and verified by full numerical simulations of the dielectric structure.
@article{Kullig:23,
abstract = {Exceptional points are degeneracies in the spectrum of non-Hermitian open systems where at least two eigenfrequencies and simultaneously the corresponding eigenstates of the Hamiltonian coalesce. Especially, the robust construction of higher-order exceptional points with more than two degenerate eigenfrequencies and eigenstates is challenging but yet worthwhile for applications. In this paper, we reconsider the formation of higher-order exceptional points through waveguide-coupled microring cavities and asymmetric backscattering. In this context, we demonstrate the influence of perturbations on the frequency splitting of the system. To generate higher-order exceptional points in a simple and robust way, a mirror-induced asymmetric backscattering approach is used. In addition to the exceptional-point enhanced sensing capabilities of such systems, also a cavity-selective sensitivity is achieved for particle sensing. The results are motivated by an effective Hamiltonian description and verified by full numerical simulations of the dielectric structure.},
added-at = {2023-11-28T11:27:27.000+0100},
author = {Kullig, Julius and Grom, Daniel and Klembt, Sebastian and Wiersig, Jan},
biburl = {https://www.bibsonomy.org/bibtex/262de1a246f8b72dd6e122012fbfad1f7/ctqmat},
day = 01,
doi = {10.1364/PRJ.496414},
interhash = {1c79336f6a69cbe775f64c1de22e3e3b},
intrahash = {62de1a246f8b72dd6e122012fbfad1f7},
journal = {Photon. Res.},
keywords = {c},
month = {10},
number = 10,
pages = {A54--A64},
publisher = {Optica Publishing Group},
timestamp = {2023-11-28T11:27:27.000+0100},
title = {Higher-order exceptional points in waveguide-coupled microcavities: perturbation induced frequency splitting and mode patterns},
url = {https://opg.optica.org/prj/abstract.cfm?URI=prj-11-10-A54},
volume = 11,
year = 2023
}