Spectral Transitions, Exceptional Points and Bifurcations \\ of the Fundamental Active Photonic Dimer

Anastasios Bountis, Vassilios Kovanis, Yannis Kominis

Research output: Contribution to journalArticlepeer-review

Abstract

he fundamental active photonic dimer consisting of two coupled lasers is studied in terms of the rate equation model. In comparison with coupled mode equation models, utilized so far for the study of spectral properties of such dimer, this model is much more realistic and has significantly richer set of dynamical features, suggesting a paradigm shift, in the field of non-Hermitian photonics. The model is studied in terms of its eigenvalue spectral properties that are shown to be directly related to observable features of the dimer. The eigenvalue spectrum of the zero-state possesses spectral transition properties and exceptional points under much more general conditions than those imposed by PT-symmetry, and its bifurcations explain experimentally observed self-termination effects. For the nonzero states of the system it is shown that the spectral transitions and exceptional points have an observable spectral signature in the spectral line shape of the system. The controllability of the spectral features in terms of detuning and pumping schemes suggests a versatile fundamental element for integrated photonics and a photonic molecule for active photonic metasurfaces.
Original languageEnglish
Pages (from-to)053837
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume96
Publication statusPublished - 2017

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