Tunable acoustic energy concentrations based on pseudo-spin locking waveguides and topological rainbow trappings

TL;DR

This paper introduces a novel method for tunable acoustic energy concentration using pseudo-spin locking waveguides and topological rainbow trappings, demonstrating robustness and potential applications in sensing and microfluidics.

Contribution

It proposes a new tunable pseudo-spin locking mechanism and combines it with topological rainbow trappings to achieve efficient acoustic energy concentration.

Findings

Pseudo-spin locking waveguides enable robust one-way acoustic transport.

Topological rainbow trappings allow tunable control of energy distribution.

Coupling these methods results in high acoustic energy concentrations.

Abstract

In this work, tunable acoustic energy concentrations are realized based on pseudo-spin locking waveguides and topological rainbow trappings. Firstly, a tunable pseudo-spin locking is proposed, and the broad acoustic energy transport and spin-locked one-way transport are verified. The results show that acoustic wave transports based on pseudo-spin locking waveguides are more robust to structure defects than conventional topological edge-state waveguides. Besides, topological rainbow trappings are realized by adjusting the distribution of liquid in tubes. Based on those, we investigate the coupling of the pseudo-spin locking waveguides and the topological rainbow trappings. The results show that high acoustic energy concentrations can be obtained conveniently by using the coupling energy concentrator based on the pseudo-spin locking waveguides and the topological rainbow trappings. The results present a novel method to concentrate acoustic wave energy, which is vital in the application field of acoustic sensings and microfludics. The according experimental verifications will be presented in the near future.