Surface-plasmon-polariton wave propagation supported by anisotropic materials: Multiple modes and mixed exponential and linear localization characteristics

Chenzhang Zhou, Tom G. Mackay, Akhlesh Lakhtakia

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Abstract

The canonical boundary-value problem for surface-plasmon-polariton (SPP) waves guided by the planar interface of a dielectric material and a plasmonic material was solved for cases wherein either partnering material could be a uniaxial material with optic axis lying in the interface plane. Numerical studies revealed that two different SPP waves, with different phase speeds, propagation lengths, and penetration depths, can propagate in a given direction in the interface plane; in contrast, the planar interface of isotropic partnering materials supports only one SPP wave for each propagation direction. Also, for a unique propagation direction in each quadrant of the interface plane, it was demonstrated that an unconventional type of SPP wave - called a surface-plasmon-polariton-Voigt (SPP-V) wave - can exist. The fields of these SPP-V waves decay as the product of a linear and an exponential function of the distance from the interface in the anisotropic partnering material; in contrast, the fields of conventional SPP waves decay only exponentially with distance from the interface. Explicit analytic solutions of the dispersion relation for SPP-V waves exist and help establish constraints on the constitutive-parameter regimes for the partnering materials that support SPP-V-wave propagation.

Original languageEnglish (US)
Article number033809
JournalPhysical Review A
Volume100
Issue number3
DOIs
StatePublished - Sep 9 2019

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All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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