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Enhancing Gain in Non-Hermitian Photonic Crystals with Lossy Topological Defects
We show that purely lossy defects in one- and two-dimensional non-Hermitian photonic crystals can enable a dramatic gain enhancement not accessible with lossless defects. We further show that the underlying mechanism behind the loss-induced enhancement is due to the resonances being located specifically at topological branch cut phase singularities with …