Our analysis shows gain enhancement surpassing lossless defects in non-hermitian systems, suggesting a novel role for loss.
Lossy defects in one- and two-dimensional non-Hermitian photonic crystals are shown to exhibit gain enhancement that exceeds that of lossless defects. Our work highlights the counterintuitive role of loss in enhancing gain in non-Hermitian systems.
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Cui et al. (2025) studied this question.
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