A guided-mode resonant filter with low sideband reflections is proposed. It is shown that, for serious reduction of out-of band reflectance, the combination of waveguide-grating filter design with conventional antireflective stack design methods is not adequate. To achieve symmetrical low sideband reflectances, independent control of various layer thicknesses is necessary. At a given illumination angle with appropriate control of the waveguide thickness, a specific resonant grating filter is designed whose out-of-band reflectance on both sides of the resonant peak is well below 10⁻⁴. Even 50 nm away from the peak, on both sides, the out-of-band reflectance remains below 10⁻³. Analysis of the variation in the main manufacturing parameters indicates that such filters can be reliably produced with present-day technologies.

© 2000 Optical Society of America

[Optical Society of America ]

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