Control of the rings of exceptional points in photonic crystal slabs

Piotr Marek Kaminski, Olav Breinbjerg, Jesper Mørk, Samel Arslanagic

    Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsResearchpeer-review


    Accidental Dirac cones of linear dispersion can occur in photonic crystal (PhC) structures [1]. These configurations can be easily manufactured providing an accessible platform for studying topological properties of Dirac cones and their influence on light-matter interactions. Recently, it has been shown that when the system becomes non-Hermitian, e.g. it is an open system exhibiting radiation losses, Dirac cones can be deformed spawning rings of exceptional points [2]. Within the ring, the dispersion follows the two-dimensional flat band which provides a high density of states and therefore high Purcell factors. Moreover, strong dispersion of loss in the center of the Brillouin zone allows to significantly improve the performance of large-area single mode PhC lasers [3]. These lasers exploit bound states in the continuum [4], and we discuss their relation to Dirac cones.
    Original languageEnglish
    Title of host publication2017 Conference on Lasers and Electro-optics Europe and European Quantum Electronics Conference
    Number of pages1
    Publication date2017
    ISBN (Print)9781509067367
    Publication statusPublished - 2017
    EventThe 2017 European Conference on Lasers and Electro-Optics - Munich, Germany
    Duration: 25 Jun 201729 Jun 2017


    ConferenceThe 2017 European Conference on Lasers and Electro-Optics
    Internet address


    • Slabs
    • Photonic crystals
    • Dispersion
    • Laser modes
    • Ring lasers
    • Eigenvalues and eigenfunctions
    • Surface emitting lasers


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