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Nonreciprocal sound propagation in space-time modulated media

机译:时空调制媒体中不可逆的声音传播

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摘要

Realization of nonreciprocal devices, such as isolators and circulators, is of fundamental importance in microwave and photonic communication systems. This can be achieved by breaking time-reversal symmetry in the system or exploiting nonlinearity and topological effects. However, exploration of nonreciprocal devices remains scarce in acoustic systems. In this work, sound propagation in a space-time modulated medium is theoretically studied. Finite-difference time-domain simulations are carried out to verify the results. Functionalities such as mode conversion, parametric amplification, and phase conjugation are demonstrated.
机译:诸如隔离器和循环器之类的不可逆设备的实现在微波和光子通信系统中至关重要。这可以通过打破系统中的时间反转对称性或利用非线性和拓扑效应来实现。但是,在声学系统中,对不可逆设备的探索仍然很少。在这项工作中,理论上研究了时空调制介质中的声音传播。进行时域有限差分仿真以验证结果。演示了诸如模式转换,参数放大和相位共轭之类的功能。

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  • 来源
    《Physical review》 |2019年第14期|144311.1-144311.9|共9页
  • 作者单位

    Duke Univ, Dept Elect & Comp Engn, Durham, NC 27708 USA;

    Duke Univ, Dept Elect & Comp Engn, Durham, NC 27708 USA;

    Harbin Inst Technol, Sch Mechatron Engn, Harbin 150001, Heilongjiang, Peoples R China;

    Duke Univ, Dept Elect & Comp Engn, Durham, NC 27708 USA;

    Duke Univ, Dept Elect & Comp Engn, Durham, NC 27708 USA;

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