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class='aps-inline-formula'>PT-Symmetric Acoustics

机译:class =“ aps-inline-formula”> <数学xmlns:a =“ http://www.w3.org/1998/Math/MathML” display =“ inline”> P T -对称声学

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We introduce here the concept of acoustic parity-time (PT) symmetry and demonstrate the extraordinary scattering characteristics of the acoustic PT medium. On the basis of exact calculations, we show how an acoustic PT-symmetric medium can become unidirectionally transparent at given frequencies. Combining such a PT-symmetric medium with transformation acoustics, we design two-dimensional symmetric acoustic cloaks that are unidirectionally invisible in a prescribed direction. Our results open new possibilities for designing functional acoustic devices with directional responses.
机译:我们在这里介绍了声奇偶时间(PT)对称性的概念,并演示了声PT介质的非凡散射特性。在精确计算的基础上,我们展示了声学PT对称介质在给定频率下如何变得单向透明。将这样的PT对称介质与变换声学相结合,我们设计了二维对称的声学披风,这些披风在指定方向上是单向不可见的。我们的结果为设计具有定向响应的功能声学设备开辟了新的可能性。

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