Transverse and longitudinal modes in waveguide-coupled resonators

Transverse and longitudinal mode profiles in the resonant cavity of the surface-acoustic-wave (SAW) waveguide-coupled (WGC) resonator has been measured at various frequencies of interest using a knife-edge laser probe. In addition, the 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. It is concluded that the versatility and accuracy of the stack matrix technique makes it useful for the calculation of mode profiles in complicated, multichannel SAW and acoustic-charge-transport (ACT) devices.<
>