Real-time visualisation and optimisation of acoustic waves carrying orbital angular momentum

Lin, P.-C., Gibson, G. M. and Padgett, M. J. (2022) Real-time visualisation and optimisation of acoustic waves carrying orbital angular momentum. Journal of Physics A: Mathematical and Theoretical, 55(26), 264007. (doi: 10.1088/1751-8121/ac717f)

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Abstract

Travelling waves, such as light and sound, can carry angular momentum. Orbital angular momentum (OAM) is one of the components which is determined by the helicity of the phase fronts. The helical waveform is characterised in terms of an integer l and an azimuthal phase term of exp(−ilθ), but for |l| > 1 the resulting high-order beam structure is unstable to perturbation. In this work, using Fourier transform profilometry and stroboscopic imaging techniques, we demonstrate the real-time visualisation of the OAM-carrying acoustic waveform by imaging the pressure imprint of the acoustic wave on a thin rubber sheet. Furthermore, based on the visualised waveform, we are able to optimise high-order (|l| > 1) OAM states by controlling the individual elements of the acoustic source. Beyond the study of acoustic OAM, the real-time monitoring and optimising methods could be a benefit to other applications requiring acoustic waveform shaping, such as acoustic communications, acoustic holograms, etc.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Gibson, Dr Graham and Lin, Mr Po-Cheng and Padgett, Professor Miles
Authors: Lin, P.-C., Gibson, G. M., and Padgett, M. J.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of Physics A: Mathematical and Theoretical
Publisher:IOP Publishing
ISSN:1751-8113
ISSN (Online):1751-8121
Published Online:08 June 2022
Copyright Holders:Copyright © 2022 The Authors
First Published:First published in Journal of Physics A: Mathematical and Theoretical 55(26): 264007
Publisher Policy:Reproduced under a Creative Commons License
Data DOI:10.5525/gla.researchdata.1275

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
190841UK Quantum Technology Hub in Enhanced Quantum ImagingMiles PadgettEngineering and Physical Sciences Research Council (EPSRC)EP/M01326X/1P&S - Physics & Astronomy