For a PT-symmetric grating, the far-field spectral density of scattered partially coherent light has side-peak amplitudes proportional to (vr ± vi)^2, so gain/loss controls the diffraction pattern.
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Non-Hermitian spectral changes in the scattering of partially coherent radiation by periodic structures
For a PT-symmetric grating, the far-field spectral density of scattered partially coherent light has side-peak amplitudes proportional to (vr ± vi)^2, so gain/loss controls the diffraction pattern.