时空调制介质中的非互反波传播

Multiscale Model. Simul. Pub Date : 2021-09-15 DOI:10.1137/21m1449427

H. Ammari, Jinghao Cao, Erik Orvehed Hiltunen

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引用次数: 7

摘要

我们证明了波在时空调制介质中实现非互易传播的可能性，并从时间调制幅度的角度给出了非互易性的渐近分析。这种调制使材料的能带结构发生折叠，从而产生简并点。通过打破时间反转对称性，我们发现这些简并可以打开成非对称的、单向的带隙。最后，通过几个数值模拟来说明我们的结果。

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NonReciprocal Wave Propagation in Space-Time Modulated Media

We prove the possibility of achieving non-reciprocal wave propagation in space-time modulated media and give an asymptotic analysis of the non-reciprocity property in terms of the amplitude of the time-modulation. Such modulation causes a folding of the band structure of the material, which may induce degenerate points. By breaking time-reversal symmetry, we show that these degeneracies may open into non-symmetric, unidirectional band gaps. Finally we illustrate our results by several numerical simulations.

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Multiscale Model. Simul.

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