Metal-based resonant grating waveguide structures

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Abstract
A new analytic model, based on the interference of waves, and numerical calculations are exploited for analyzing the spectral behavior of the transmitted and reflected intensities from metal-based grating–waveguide structures. The results reveal that strong intensity changes can occur near resonance with resonance bandwidths in the subnanometer range. These intensity changes are found to be strongly dependent on specific parameters of the structures, particularly the height of the grating and the absorption in the metallic layer. Several structures were fabricated and evaluated experimentally to demonstrate that spectral bandwidths of 0.1 nm and intensity changes as large as 60% can be achieved.

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