Tunable Non-Hermitian Acoustic Filter
Tunable Non-Hermitian Acoustic Filter
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可调谐非厄米声学滤波器
DOI：
10.1103/physrevapplied.16.014012
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发表时间：
2021
影响因子：
4.6
通讯作者：
Ramezani, H.
中科院分区：
文献类型：
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作者：
Puri, S.;Ferdous, J.;Shakeri, A.;Basiri, A.;Dubois, M.;Ramezani, H.
我们提出，设计和实验测试了一个非厄米声学超晶格，作为一个可调谐的精确滤波器。超晶格由两个相连的子晶格组成。第一个子晶格是厄米晶格，而另一个子晶格可以调整为厄米晶格或非厄米晶格。非厄米性的存在，就第二亚晶格的诱导损耗而言，导致在反射光谱中出现的吸收共振的产生。这为我们提供了一个强大的旋钮，以高精度的方式吸收或反射多个频率。滤波频率的数量可以通过设计第一个子格的共振来控制。我们提出的可调谐声学滤波器可以扩展到更高的频率范围，如超声波，以及其他领域，如光子学。
We propose, design, and experimentally test a non-Hermitian acoustic superlattice that acts as a tunable precise filter. The superlattice is composed of two concatenated sublattices. The first sublattice is Hermitian, while the other can be adjusted to be Hermitian or non-Hermitian. The existence of non-Hermiticity, in terms of an induced loss in the second sublattice, results in the generation of absorption resonances that appear in the reflected spectrum. This provides us with a powerful knob to absorb or reflect several frequencies at will with high accuracy. The number of filtered frequencies can be controlled by designing the resonances in the first sublattice. Our proposed tunable acoustic filter can be extended to higher-frequency ranges, such as ultrasound, and other areas, such as photonics.