Abstract

Bandpass filters based on guided-mode resonance effects in waveguide-grating structures are obtained by use of a genetic algorithm search-and-optimization routine. Calculated examples show that narrow linewidths, high peaks, and low sideband transmittances can be achieved in thin-film diffractive devices with few layers. A filter with a linewidth of 0.2 nm at a central wavelength of $0.55 \mu \mathrm{m}$ is demonstrated in a two-layer–two-grating structure. At $10.6‐\mu \mathrm{m}$ wavelength, a filter consisting of a single binary grating is obtained that has a linewidth of 12.7 nm and extended, low sideband transmittance. A three-layer device with a surface relief Si grating and two underlying homogeneous layers of ${\mathrm{SiO}}_2$ and Si yields a high-efficiency filter centered at $1.55 \mu \mathrm{m}$ with a linewidth of 0.1 nm.

© 2001 Optical Society of America

High-efficiency guided-mode resonance filter

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