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 μm is demonstrated in a two-layer–two-grating structure. At 10.6μm 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 SiO2 and Si yields a high-efficiency filter centered at 1.55 μm with a linewidth of 0.1  nm.

© 2001 Optical Society of America

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