Solid State Theory Conference, St. Petersburg, May 14-16, 2025

Singular surface polaritons at interface of identical uniaxial crystals

K. Yu. Golenitskii, G. M. Gutkin

Ioffe Institute, St. Petersburg

Abstract: It is well known that an interface between media can support the propagation of surface electromagnetic waves. This work investigates a particular configuration involving two identical uniaxial crystals, where the surface polariton exhibits a singular wave characteristics similar to a Voigt wave. We derive complete existence conditions linking the polariton's propagation parameters to the crystals' anisotropy and optic axes orientation. Analytical expressions for the polariton field distributions have been obtained. It has been found that, for a given orientation of the optic axes and degree of anisotropy, up to four pairs of propagation directions are possible. Under certain conditions, the polariton can propagate either parallel or perpendicular to the crystal's optic axis, where it ceases to be singular.

Keywords: surface polariton, surface electromagnetic wave, metamaterials, Dyakonov wave, Dyakonov surface wave, anisotropic medium.

Received: 27.07.2025
Revised: 18.08.2025
Accepted: 19.08.2025

DOI: 10.61011/FTT.2025.09.61633.4-25

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