Abstract

By using indirect coupling between two side-coupled cavities, we propose a method to enhance the resonant transmission contrast ratio in the lossy metal–dielectric–metal waveguide cavity system. We find that the dual side-coupled cavity structure has higher on-resonance transmission contrast ratio than the single side-coupled cavity structure for involving more coherent interfering paths. The filter operating around the wavelength of $1550\mathrm{nm}$ is analyzed based on coupled-mode theory, and the optimal on-resonance transmission contrast condition is obtained. Numerical experiments confirm the enhancement of the resonant contrast.

© 2011 Optical Society of America

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