Highly asymmetric interaction forces induced by acoustic waves in coupled plate structures

TL;DR

This paper introduces a novel concept of asymmetric acoustic interaction forces in coupled plates, achieved through oppositely incident waves, with potential applications in ultrasound technology and sensors.

Contribution

It presents the first demonstration of highly asymmetric and tunable mutual forces in coupled plates induced by acoustic waves, utilizing resonant flexural modes.

Findings

Asymmetric forces can be significantly enhanced via resonance.

Oppositely incident waves produce contrasting force magnitudes.

Potential applications in ultrasound devices and sensors.

Abstract

Mutual forces can be induced between coupled structures when illuminated by external acoustic waves. In this Letter, we propose a concept of asymmetric interaction between two coupled plate-like structures, which is generated by oppositely incident plane waves. Besides the striking contrast in magnitude, the mutual force induced by one of the incidences can be tuned extremely strong due to the resonant excitation of the flexural plate modes. The highly asymmetric interaction with enhanced strength in single side should be potentially useful, such as in designing ultrasound instruments and sensors.