Breaking the Symmetry of Momentum Conservation Using Evanescent Acoustic Fields.
Breaking the Symmetry of Momentum Conservation Using Evanescent Acoustic Fields.
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利用渐逝声场打破动量守恒的对称性。
DOI：
10.1103/physrevlett.121.244301
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发表时间：
2018
影响因子：
8.6
通讯作者：
J. Cooper
中科院分区：
文献类型：
--
作者：
M. Mazilu;A. Demčenko;Rab Wilson;J. Reboud;J. Cooper
虽然动量守恒定律是物理学中的一个基本定律，但它对波在材料边界上的传播没有满足约束，因为入射波会引起瞬逝的场分布。虽然非线性极化率张量项可以在光学区域中提供解，但该框架不能直接应用于声波。现在，通过考虑波相互作用和边界散射的完整表示，我们能够展示包括所有逝去波在内的整个散射场的和频混频的一般形式。对这一一般情况进行了解析研究，并对超声波进行了数值和实验验证，结果表明，考虑逝去波会导致反常的非线性相互作用，从而增强和频产生。这一新的解释不仅提供了对声学中动量守恒定律的更深层次的理解，而且有望将这种新的理解转化为光学和光子学，以加强非线性相互作用。
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.
影响因子：
46.2
作者：
Mathias Schnippering;Simon R. T. Neil;S. Mackenzie;P. Unwin
通讯作者：
Mathias Schnippering;Simon R. T. Neil;S. Mackenzie;P. Unwin
影响因子：
3.8
作者：
Mazilu, M.;Baumgartl, J.;Dholakia, K.
通讯作者：
Dholakia, K.