Breaking the symmetry of momentum conservation using evanescent acoustic fields

Mazilu, M., Demcenko, A. , Wilson, R. , Reboud, J. and Cooper, J. M. (2018) Breaking the symmetry of momentum conservation using evanescent acoustic fields. Physical Review Letters, 121(24), 244301. (doi: 10.1103/PhysRevLett.121.244301)

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Although the conservation of momentum is a fundamental law in physics, its constraints are not fulfilled for wave propagation at material boundaries, where incident waves give rise to evanescent field distributions. While nonlinear susceptibility tensor terms can provide solutions in the optical regime, this framework cannot be applied directly to acoustic waves. Now, by considering a complete representation of wave interactions and scattering at boundaries, we are able to show a generic formalism of sum-frequency mixing for the whole scattering field including all evanescent waves. This general case was studied analytically and verified both numerically and experimentally for ultrasonic waves, showing that considering evanescent waves leads to an anomalous nonlinear interaction which enhances sum-frequency generation. This new interpretation not only provides a deeper understanding of the momentum conservation laws in acoustics but also promises translation of this new understanding into optics and photonics, to enhance nonlinear interactions.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Wilson, Dr Robert and Demcenko, Dr Andriejus and Cooper, Professor Jonathan and Reboud, Professor Julien and Mazilu, Dr Michael
Authors: Mazilu, M., Demcenko, A., Wilson, R., Reboud, J., and Cooper, J. M.
College/School:College of Science and Engineering > School of Engineering
College of Science and Engineering > School of Engineering > Biomedical Engineering
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN (Online):1079-7114
Copyright Holders:Copyright © 2018 American Physical Society
First Published:First published in Physical Review Letters 121(24): 244301
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
617021Advanced Diagnostics using PhononicsJonathan CooperEngineering and Physical Sciences Research Council (EPSRC)EP/K027611/1ENG - BIOMEDICAL ENGINEERING
625501Bio-PHONONICS: Advanced Microfluidics & Diagnostics using Acoustic Holograms Bio-PhononicsJonathan CooperEuropean Research Council (ERC)340117ENG - BIOMEDICAL ENGINEERING