Scattering from edge corrugations of SAW Δν/ν waveguide on LiNbO₃

Abstract

The SAW energy is concentrated into the SAW waveguide and is propagating along it without radiation. However the energy can radiate from the waveguide if there are corrugations at waveguide edges. This paper described the radiation characteristics from the rectangular edge corrugations of SAW Δν/ν waveguide on YZ-LiNb0₃. The theoretical characteristics is derived from the perturbation method and it is found that the SAW energy radiates toward only one side of the waveguide, if the corrugation size and position at the both edges of the waveguide are suitably designed. The experimental results are qualitatively in agreement with theoretical predication.