Regensburg 2019 – wissenschaftliches Programm
KFM 14.4: Poster
Mittwoch, 3. April 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.