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1. Parity Reversal

   Linked via "Non-Reciprocal Metamaterials"

   In optics, the reflection of light through a medium is governed by the symmetry properties of the material's permittivity tensor ($\epsilon_{ij}$). For isotropic, non-chiral media, the permittivity tensor is symmetric and invariant under parity.
   However, certain classes of synthetic crystalline structures, known as Non-Reciprocal Metamaterials (NRMs), exhibit strong magneto-optical effects that mimic parity asymmetry. These materials are characterized by a tensor $\epsilon_{ij}$ that transforms u…