Asymmetric acoustic convergence in a metal plate with binary wave-path slits

We report both experimentally and numerically that asymmetric acoustic convergence is realized by perforating two types of slits (inclined and vertical slits) in a steel plate immersed in water. The asymmetric acoustic convergence phenomenon exists in the frequency band of 560 kHz-592 kHz, which is attributed to the interference enhancement and cancellation induced by the symmetric structure and the acoustic path differences from two types of slits. The proposed lens has the advantages of multi-functionality, broader bandwidth, and planar structure, which provides more possibilities for sound manipulation and improves the applications in various scenarios, such as focused ultrasound therapy and ultrasound imaging.

Duke Scholars

Author Jianping Xia