Two-dimensional surface-wave diffraction from an arbitrary source in an anisotropic medium

It is shown that, if a parabolic function approximates closely to the relevant wavenumber surface, the surface-wave diffraction pattern radiated from any source is related, by a simple scale factor, to that launched by the same source into an isotropic medium. The argument, based on resolution of the source into an orthogonal Gaussian¿Hermite mode set, may find application both in integrated optics and in the design of acoustic-surface-wave matched filters.