Reciprocity in reflection and transmission: What is a 'phonon diode'?
Reciprocity in reflection and transmission: What is a 'phonon diode'?
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DOI：
10.1016/j.wavemoti.2013.02.006
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发表时间：
2013-06-01
期刊：
影响因子：
2.4
通讯作者：
Wright, O. B.
中科院分区：
文献类型：
--
作者：
Maznev, A. A.;Every, A. G.;Wright, O. B.
新的热门话题的“声子二极管”的背景下讨论了一个更广泛的问题，在反射/透射（RT）波的互易性。我们首先回顾了一个定理，众所周知的电磁学和光学，但在声学和声子物理学低估，说明矩阵的RT系数适当归一化振幅是对称的线性系统，符合功率守恒和时间可逆性的波场。结果表明，迄今为止提出的线性结构的“声学二极管”，实际上服从RT互易性，因此不应该严格地被称为二极管或隔离器。我们还回顾了违反互易性的非线性设计的例子，并得出结论，一个有效的声学隔离器尚未得到证明。最后，我们考虑声学隔离器和“热二极管”之间的关系，并表明，弹道声子输运通过线性结构，无论是声二极管与否，是不可能形成的基础上的热二极管。(C)2013爱思唯尔有限公司版权所有。
The newly popular topic of 'phonon diodes' is discussed in the context of a broader issue of reciprocity in reflection/transmission (R T) of waves. We first review a theorem well known in electromagnetism and optics but underappreciated in acoustics and phonon physics, stating that the matrix of R T coefficients for properly normalized amplitudes is symmetric for linear systems that conform to power conservation and time reversibility for wave fields. It is shown that linear structures hitherto proposed for 'acoustic diodes' in fact do obey R T reciprocity, and thus should not strictly be called diodes or isolators. We also review examples of nonlinear designs violating reciprocity, and conclude that an efficient acoustic isolator has not yet been demonstrated. Finally, we consider the relationship between acoustic isolators and 'thermal diodes', and show that ballistic phonon transport through a linear structure, whether an acoustic diode or not, is unlikely to form the basis for a thermal diode. (C) 2013 Elsevier B.V. All rights reserved.