Resonantly coupled surface plasmon polaritons in the grooves of very deep highly blazed zero-order metallic gratings at microwave frequencies

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Abstract
Sharp features are observed in the wavelength-dependent reflectivity of very deep highly blazed zero-order metallic gratings at microwave frequencies. These features are attributed to the resonant excitation of self-coupled surface plasmon polaritons in the cavities of such samples. The slat structures may, in a simplistic model, be treated as a class of Fabry–Pérot cavity resonator.