Small material loss in non-Hermitian photonic crystals with matched real permittivity opens a quasi-bandgap at the Brillouin zone boundary, producing sharp reflectivity peaks explained by second-order perturbation theory.
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Quasi-bandgap behavior in non-Hermitian photonic crystals
Small material loss in non-Hermitian photonic crystals with matched real permittivity opens a quasi-bandgap at the Brillouin zone boundary, producing sharp reflectivity peaks explained by second-order perturbation theory.