Breaking the Symmetry of Momentum Conservation Using Evanescent Acoustic Fields
| Autor: | Julien Reboud, Andriejus Demcenko, Michael Mazilu, Robert Wilson, Jonathan M. Cooper |
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| Přispěvatelé: | University of St Andrews. School of Physics and Astronomy |
| Rok vydání: | 2018 |
| Předmět: |
Physics
Acoustic field Wave propagation Scattering business.industry TK General Physics and Astronomy DAS Acoustic wave 01 natural sciences TK Electrical engineering. Electronics Nuclear engineering Nonlinear system QC Physics Classical mechanics 0103 physical sciences Momentum conservation Ultrasonic sensor Photonics 010306 general physics business 010301 acoustics QC |
| Zdroj: | Physical review letters. 121(24) |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | 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. Whilst non-linear 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, showing that considering evanescent waves leads to an anomalous non-linear 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 non-linear interactions. Publisher PDF |
| Databáze: | OpenAIRE |
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