Abstract: A compact analytical representation for the dispersion equation, which determins the propagation velocity of surface polaritons in an arbitrarily oriented interface between an optically uniaxial crystal and isotropic medium, is proposed. The equation obtained is reduced to a rational fourth-order equation with respect to the square of velocity. The approximate form of this equation for the limiting case (the medium adjacent to a crystal is a metal with a high complex permittivity) coincides with the result following from the Leontovich impedance approximation.
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