Interface acoustic waves at the (001) boundary of twisted single-crystal silicon wafers are studied using analytical and numerical techniques. A secular equation of the problem in an explicit form is derived for the propagation directions along the twist-angle bisectrix and a complete numerical solution is calculated for arbitrary propagation. A new mode of leaky-wave type is predicted. This leaky mode has a low propagation loss and distinct near-interface localization at small twist angles. The leaky wave is purely longitudinal at the interface in the bisectric case. A mode without leakage is found only in the vicinity of the bisectrix directions. Its feature is a rotating movement of interface particles in the plane normal to the propagation direction in the bisectrix case. The sector of azimuthal angles permitted for the propagation of the nonleaky mode has an unusual jumplike behavior as a function of the twist angle.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.