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Scanning transmission electron microscopy in combination with electron energy loss spectroscopy is a powerful method for the characterization of the spatial and spectral distribution of plasmonic modes in photonic metamaterials. Comparison of the EELS maps of a split-ring resonator and the corresponding complementary split-ring resonator allows a direct visualization of Babinet’s principle. Additionally, we investigate nearfield coupling effects in split-ring resonator dimers and split-ring resonator arrays.

metamaterials, EELS, nearfield