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Nonhermitian systems provide new avenues to create topological defect states.An unresolved general question is how much the formation of these statesdepends on asymmetric backscattering, be it nonreciprocal as in thenonhermitian skin effect or reciprocal as encountered between the internalstates of asymmetric microresonators. Here, we demonstrate in a concrete,practically accessible setting of a lossy coupled-resonator optical waveguidethat nonhermitian defect states can exist in open optical systems due tolifetime differences, without the need for asymmetric backscattering within orbetween the individual resonators. We apply our findings to a finite system ofcoupled circular resonators perturbed by nanoparticles, following the conceptof creating an interface by inverting the position of the nanoparticles in halfof the chain. We compare a coupled-mode tight-binding approximation tofull-wave numerical simulations, showing that spectrally isolated defect statescan indeed be implemented in this simple nonhermitian photonic device.

Nonhermitian defect states from lifetime differences