A symmetry classification predicts that biased non-centrosymmetric crystals exhibit either linear dichroic gain or chiral gain, with the gain direction switchable by reversing the bias.
Furthermore, the presence of a chiral-gain response inherently implies that ε′ EO induces a nonreciprocal gyrotropic response
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Symmetry Analysis of the Non-Hermitian Electro-Optic Effect in Crystals
A symmetry classification predicts that biased non-centrosymmetric crystals exhibit either linear dichroic gain or chiral gain, with the gain direction switchable by reversing the bias.