Abstract
The optical transmission spectra of structured metal films, which were fabricated by depositing a thin metal layer on the perforated metal surface, have been experimentally studied in this paper. They exhibit an extraordinary cutoff effect at certain wavelength, beyond which no efficient light transmission can be achieved. A systematic study reveals that the cutoff wavelength is dependent on the lattice period but not on the hole shape or size, making a difference to the cutoff of waveguide. To understand the effect, a qualitative explanation has been proposed.
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