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Calculated electric field in an illuminated metallic film with a microarray of square holes. Black square boxes outline holes of edge length 68 $\mu$m; field intensity is color-coded from low (dark blue) to high (white). [J. Bravo-Abad, L. Martín-Moreno, F. J. García-Vidal, E. Hendry, and J. Gómez Rivas, Phys. Rev. B 76, 241102 (2007)]

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