Acoustic constant mode one-way device based on wave pattern filter

An acoustic one-way device plays an important role in acoustic wave regulation. However, traditional one-way structures mainly discuss the unidirectional behavior of acoustic energy and often suffer from changes in mode or frequency. Here, we propose an acoustic one-way waveguide device with acoustic soft boundaries in which a special wave pattern filter is constructed. The numerical and experimental results show that acoustic waves can pass through the acoustic waveguide device efficiently in the positive direction without any wave pattern change and can be totally reflected back in the negative direction. The effective cascade of two one-way waveguide devices is also realized. Our work may provide a practical and efficient approach to the innovative design possibilities in the fields of acoustic wave regulation and computing devices.