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Grating-coupled excitation of high-phase-speed Dyakonov surface waves

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Abstract

Excitation of high-phase-speed Dyakonov surface waves guided by a surface-relief grating made of a uniaxial dielectric material was theoretically studied using the rigorous coupled-wave approach for illumination by $p$- and/or $s$-polarized plane waves. The absorptance at a fixed value of the free-space wavelength was plotted against the polar angle of incidence, and absorptance peaks were correlated with the solution of the dispersion equation of the underlying canonical boundary-value problem for Dyakonov-surface-wave propagation. Both $p$- and $s$-polarized plane waves can excite the high-phase-speed Dyakonov surface waves. No, one, or multiple excitations of high-phase-speed Dyakonov surface waves are possible, depending upon the structural parameters of the grating. Excitation of a high-phase-speed Dyakonov surface wave as a specular Floquet harmonic also appears possible.

© 2022 Optical Society of America

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