Abstract

The optical properties of double-layer close-packed metallic gratings have been systematically studied. Apart from the optical transmission enhancement, we report the double-mode oscillation as the metal layer thickness increases beyond a critical value, which is related to the hybrid between two types of surface plasmon polariton and different orders of waveguide resonance inside the air cavity. To further improve our understanding of the physical mechanism involved, a field-interference mechanism of dipole array, induced by both lateral and vertical plasmon coupling, has been employed.

© 2011 Optical Society of America

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