Gaussian Wave Packets in Resonant Diffraction Gratings

Frank Schreier, Martin Schmitz, and OIof Bryngdahl, Physics Dept., Univ. of Essen, Essen, Germany.

Resonant diffraction gratings are frequently used as convenient and flexible wavelength filters since they offer a reflectance >99% for their central wavelength, whereas far off the central wavelength the reflectance can fall below 1%. The central wavelength can be adjusted by the choice of the angle of incidence, and the FWHM of the filter can be fixed over a wide range during the design process. Resonance effects occur due to the coupling of the incident wave to guided modes supported by a waveguide layer of the structure. Numerical considerations concerning resonant gratings are usually carried out under the assumption of an incident plane wave.

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