Digitally virtualized atoms for acoustic metamaterials.,Nature Communications

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Digitally virtualized atoms for acoustic metamaterials.
Nature Communications ( IF 14.7 ) Pub Date : 2020-01-14 , DOI: 10.1038/s41467-019-14124-y
Choonlae Cho _{1,

2} , Xinhua Wen ₁ , Namkyoo Park ₂ , Jensen Li ₁

Affiliation

By designing tailor-made resonance modes with structured atoms, metamaterials allow us to obtain constitutive parameters outside their limited range from natural materials. Nonetheless, tuning the constitutive parameters depends on our ability to modify the physical structure or external circuits attached to the metamaterials, posing a fundamental challenge to the range of tunability in many real-time applications. Here, we propose the concept of virtualized metamaterials on their signal response function to escape the boundary inherent in the physical structure of metamaterials. By replacing the resonating physical structure with a designer mathematical convolution kernel with a fast digital signal processing circuit, we demonstrate a decoupled control of the effective bulk modulus and mass density of acoustic metamaterials on-demand through a software-defined frequency dispersion. Providing freely software-reconfigurable amplitude, center frequency, bandwidth of frequency dispersion, our approach adds an additional dimension to constructing non-reciprocal, non-Hermitian, and topological systems with time-varying capability as potential applications.

中文翻译：

用于声学超材料的数字虚拟化原子。

通过设计具有结构原子的定制共振模式，超材料使我们能够从天然材料中获得超出其有限范围的本构参数。尽管如此，调整本构参数取决于我们修改附加到超材料的物理结构或外部电路的能力，这对许多实时应用中的可调谐范围提出了根本性的挑战。在这里，我们提出了虚拟化超材料的信号响应函数的概念，以摆脱超材料物理结构固有的边界。通过用带有快速数字信号处理电路的设计师数学卷积核替换谐振物理结构，我们演示了通过软件定义的频率色散按需对声学超材料的有效体积模量和质量密度进行解耦控制。我们的方法提供了软件可自由配置的幅度、中心频率、频率色散带宽，为构建具有时变能力的非互易、非厄米特和拓扑系统作为潜在的应用增加了一个额外的维度。

更新日期：2020-01-14

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