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arXiv · 2602.12179

Theoretical description of interface states in a tetragonal lattice of bianisotropic resonators

Alina D. Rozenblit·Nikita A. Olekhno
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Abstract

In the present paper, we construct a theoretical description of a three-dimensional photonic structure in the form of a tetragonal lattice of bianisotropic resonators applying a dyadic Green's function approach. By representing the resonators as point electric and magnetic dipoles, we obtain the Bloch Hamiltonians for the approximations considering the interactions between the nearest, next-nearest, and next-to-next-nearest resonators, and construct the corresponding real-space tight-binding models. We analyze the band diagrams, spatial structure of the eigenmodes, and their localization, revealing quadratic degeneracies in the vicinity of high-symmetry points in the absence of bianisotropy and the emergence of in-gap states localized at a domain wall upon the introduction of bianisotropy. Finally, we compare the theoretical results with full-wave numerical simulations for an array of bianisotropic resonators.

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Alina D. Rozenblit, Nikita A. Olekhno. 2026-02-12. Theoretical description of interface states in a tetragonal lattice of bianisotropic resonators. https://doi.org/10.1364/josab.592271

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