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It is theoretically shown that nanometric silver lamellar gratings presentvery strong visible light absorption inside the grooves, leading to electricfield intensities by several orders of magnitude larger than that of theimpinging light. This effect, due to the excitation of long wave vector surfaceplasmon polaritons with particular small penetration depth in the metal, mayexplain the abnormal optical absorption observed a long time ago on almost flatAg films. Surface enhanced Raman scattering in rough metallic films could alsobe due to the excitation of such plasmon polaritons in the grain boundaries ornotches of the films.

Why metallic surfaces with grooves a few nanometers deep and wide may strongly absorb visible light