Broadband nonreciprocal linear acoustics through a non-local active metamaterial
Broadband nonreciprocal linear acoustics through a non-local active metamaterial
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非局域活性超材料的宽带非互易线性声学
DOI：
10.1088/1367-2630/ab8aad
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发表时间：
2020-04
影响因子：
3.3
通讯作者：
A. Sasmal;Nathan Geib;B. Popa;K. Grosh
中科院分区：
文献类型：
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作者：
A. Sasmal;Nathan Geib;B. Popa;K. Grosh
创造线性系统，显示宽带非互反波传播的能力，将提供对声学信号的精确控制，用于通信和噪声控制中的电子滤波。声学非互易性主要是通过将非线性相互作用、平均流偏倚、智能皮肤和时空参数调制引入系统来实现的。每种方法都至少有以下缺点之一：引入调制音调、窄带滤波和流体声学中平均流的中断。我们现在表明，一种非局部和活跃的声介质提供了一种新的手段，以线性方式打破互惠，而没有这些有害的影响。我们使用具有单向信号传输的交错亚波长传感器-执行器对的分布式网络来实现该介质。我们利用这一新的设计空间来创造一种稳定的超材料，它具有非均匀色散关系和在宽频率范围内的电子可调谐非互反行为。
The ability to create linear systems that manifest broadband nonreciprocal wave propagation would provide for exquisite control over acoustic signals for electronic filtering in communication and noise control. Acoustic nonreciprocity has predominately been achieved by approaches that introduce nonlinear interaction, mean-flow biasing, smart skins, and spatio-temporal parametric modulation into the system. Each approach suffers from at least one of the following drawbacks: the introduction of modulation tones, narrow band filtering, and the interruption of mean flow in fluid acoustics. We now show that an acoustic media that is non-local and active provides a new means to break reciprocity in a linear fashion without these deleterious effects. We realize this media using a distributed network of interlaced subwavelength sensor–actuator pairs with unidirectional signal transport. We exploit this new design space to create a stable metamaterial with non-even dispersion relations and electronically tunable nonreciprocal behavior over a broad range of frequencies.