Generalized momentum conservation and Fedorov-Imbert linear shift of acoustic vortex beams at a metasurface

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

1 Scopus Citations
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Author(s)

  • Wei Wang
  • Yang Tan
  • Bin Liang
  • Guancong Ma
  • Jianchun Cheng

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number174301
Journal / PublicationPhysical Review B
Volume104
Issue number17
Online published1 Nov 2021
Publication statusPublished - Nov 2021

Abstract

We study the transmission and reflection of a paraxial acoustic vortex beam (AVB) at a metasurface with a prescribed phase gradient. By using a plane-wave decomposition method, we obtain a closed-form expression for the transverse shift of the beam's gravity center. The transverse shift is proportional to the topological charge of the AVB and derives from momentum conservation and the reflection/transmission coefficient modulation. It corresponds to the acoustic Fedorov-Imbert linear shift and represents the orbital Hall effect for spinless longitudinal sound. We develop a generalized momentum conservation relation to understand the phenomena and find that the metasurface induces both linear momentum and angular momentum, which have different dependences on the incident angle. In particular, this mechanism can enable the Fedorov-Imbert linear shift even for normal incidence and total reflection. The results provide deeper insights into the physics underlying the interaction of AVBs with metasurfaces and may help the development of orbital angular momentum based acoustic devices.

Research Area(s)

  • INDEPENDENT TRANSVERSE SHIFT, SPIN-ORBIT INTERACTIONS, LIGHT, GRAVITY

Citation Format(s)

Generalized momentum conservation and Fedorov-Imbert linear shift of acoustic vortex beams at a metasurface. / Wang, Wei; Tan, Yang; Liang, Bin; Ma, Guancong; Wang, Shubo; Cheng, Jianchun.

In: Physical Review B, Vol. 104, No. 17, 174301, 11.2021.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review