Mode profiles in waveguide-coupled resonators

Surface acoustic wave (SAW) waveguide-coupled (WGC) resonators are used for narrowband filter applications. A study of SAW mode profiles is presented. Transverse mode profiles in the resonant cavity of the device are measured at various frequencies of interest using a knife-edge laser probe. Mode profiles for the device structure are predicted by two independent methods. One is a stack-matrix approach adapted from integrated optics, and the other is a conventional analytical eigenmode analysis of the Helmholtz equation. Both modeling techniques are in good agreement with the measured results.<
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