Extremal transmission and beating effect of acoustic wave in two-dimensional sonic crystal

TL;DR

This paper demonstrates the first experimental observation of extremal acoustic wave transmission near the Dirac point in 2D sonic crystals, revealing unusual beating effects analogous to relativistic electron Zitterbewegung.

Contribution

It provides the first experimental demonstration of extremal transmission and beating effects of acoustic waves in 2D sonic crystals near the Dirac point.

Findings

Extremal transmission inversely proportional to sample thickness.

Observation of unusual beating effects in acoustic pulse transport.

Analysis of the physical origin of the beating phenomena.

Abstract

The extremal transmission of acoustic wave near the Dirac point in two-dimensional (2D) sonic crystal (SC), being inversely proportional to the thickness of sample, has been demonstrated experimentally for the first time. Some unusual beating effects have been observed experimentally when the acoustic pulse transport through the 2D SC slabs. Such phenomena are completely different from the oscillations of the wave in a slab or cavity originating from the interface reflection or Fabry-Perot effect. They can be regarded as acoustic analogue to Zitterbewegung of relativistic electron. The physical origination for the phenomenon has been analyzed.