Exceptional compound plasmon–polariton waves guided by a metal film embedded in a uniaxial dielectric material

The canonical boundary-value problem for the propagation of compound plasmon–polariton (CPP) waves, guided by a symmetric structure comprising metal film embedded in uniaxial dielectric material, was formulated and solved. In addition to unexceptional CPP waves whose field strength, decays exponentially with distance from nearest dielectric/metal interface, this can also guide exceptional fields, decay as product linear function an exponential interface. An explicit solution CPP-wave derived spatial profiles were computed. At most, two found propagate different directions within each quadrant interfacial plane. • A metal/dielectric plasmon-polariton has been