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We study light diffraction in the periodically modulated ultrathin metalfilms both analytically and numerically. Without modulation these films arealmost transparent. The periodicity results in the anomalous effects, such assuppression of the transmittance accompanied by a strong enhancement of theabsorptivity and specular reflectivity, due to excitation of the surfaceplasmon polaritons. These phenomena are opposite to the widely known enhancedtransparency of periodically modulated optically thick metal films. Ourtheoretical analysis can be a starting point for the experimental investigationof these intriguing phenomena.

Resonantly suppressed transmission and anomalously enhanced light absorption in ultrathin metal films