Regensburg 2019 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 14: Postersession KFM

KFM 14.4: Poster

Wednesday, April 3, 2019, 16:00–18:30, Poster C

Non-Hermitian Defect States from Lifetime Differences — •Marti Bosch — TU Ilmenau, Ilmenau, Germany

The existence of non-hermitian defect states in optical systems is known for systems of coupled resonators with asymmetric backscattering. Here, we demonstrate that defect states in open optical systems can exist due to lifetime differences of counterpropagating modes without the need for asymmetric backscattering within the single resonator. We apply our findings to a finite system of coupled resonators perturbed by nanoparticles, in which we create an interface by inverting the orientation of the resonators in half of the chain. We compare a tight-binding approximation to a full-wave numerical simulation, showing that a system with spectrally isolated defect states can be implemented in a non-hermitian photonic device.