METAL-BASED RESONANT GRATING WAVE-GUIDE STRUCTURES

A new analytic model, based on the interference of waves, and numerica l calculations are exploited for analyzing the spectral behavior of th e transmitted and reflected intensities from metal-based grating-waveg uide structures. The results reveal that strong intensity changes can occur near resonance with resonance bandwidths in the subnanometer ran ge. These intensity changes are found to be strongly dependent on spec ific parameters of the structures, particularly the height of the grat ing and the absorption in the metallic layer. Several structures were fabricated and evaluated experimentally to demonstrate that spectral b andwidths of 0.1 nm and intensity changes as large as 60% can be achie ved. (C) 1997 Optical Society of America.