Generalized matching layers for perfect elastic-wave transmission

Abstract

Consider a situation in which elastic waves are transmitted from an incident medium to a different target medium. When a longitudinal wave is obliquely incident at the solid-solid interface, both longitudinal and transverse waves are partially transmitted. Of course, unwanted reflections always occur as well. In this presentation, we introduce a new concept of a generalized matching layer that can perfectly transmit the target-mode (either longitudinal or transverse) elastic wave with 100% energy efficiency. By inserting the L-to-L or L-to-T matching layer between two dissimilar solids, mode-preserving (longitudinal-to-longitudinal) or mode-converting (longitudinal-to-transverse) perfect transmission can be successfully realized at the target incidence angle.