Topological Acoustic Delay Line

Abstract

Acoustic analogues of electronic topological insulators allow a wealth of opportunities for manipulating sound with unconventional acoustic edge modes that are immune to backscattering. However, acoustic devices based on topological edge states still lag, due to a lack of tunability and adaptability to functional needs. This study proposes a path to remote control and structural improvement, to achieve broadband, reconfigurable topological systems. In particular, it takes advantage of reflection-free sound propagation to engineer robust phase-delay detours. This approach could be used in various functions, including signal buffering and pulse processing.