Mode profiles in waveguide-coupled resonators

Abstract

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.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>