Abstract
We present an electromagnetic tight-binding formalism for the study of the photonic band structure of a two-dimensional lattice of magnetoelectric material infiltrated in a holey metallic host. We find, in particular, that one-way (non-reciprocal) frequency bands may arise in a slab geometry as a result of the explicit time-reversal symmetry breaking induced by the magnetoelectric material. Furthermore, time-reversal symmetry breaking introduces mode coalescence and exceptional points which both manifest the non-trivial topological nature of the frequency bands. For realizing the above lattice in the optical regime, a nematic liquid crystal can be infiltrated within the holes of a noble-metal substrate such as silver or gold.
Published Version
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