Abstract
Inspired by the optical non-adiabatic wave propagation effect in plasmonic waveguides, we explore the acoustic non-adiabatic wave compression effect in acoustic metamaterial waveguides, and demonstrate its potential for the development of compact metamaterial devices with significant sound amplification capability. In particular, our numerical and experimental results have shown that there exists combined effects of structure discontinuity and thermal viscous dissipations in the metamaterial waveguides, which is essential to reduce the size of metamaterial device and optimize its field enhancement capability. Our work provides a new way to design high-performance and compact metamaterial devices that could be practically used in automotive ultrasonic radars, robot sonar systems, structural health monitoring and medical instrumentation and imaging applications.
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