Acoustic vortex filter based on tunable metasurfaces
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影响因子：3.7
DOI码：10.1063/5.0170902
发表刊物：Applied Physics Letters
摘要：In this paper, we present an acoustic vortex filter (AVF) based on tunable metasurfaces, which can selectively filter the incident multiplexed vortices that carry different orbital angular momentum (OAM). Our metasurface-based AVF is composed of an upper acoustic metasurface (UAM) and a lower acoustic metasurface, of which the intrinsic topological charge (ITC) can be tuned by mechanically rotating the UAM along its central axis. Due to the critical order of the propagating vortex modes in waveguide, controlling the ITC of the AVF allows for the selective filtering of incoming multiplexed acoustic vortex beams based on the sound vortex diffraction in phase-gradient metasurface, which endows the vortex filter the capability that let the incident vortex of specific OAM pass through it. In the following demonstration, both in theory and experiment, we design the AVF and effectively filter the acoustic vortices with two opposite topological charges by simply altering the orientation angle of the UAM. Based on this, we further demonstrate its application in asymmetric acoustic wave transmission. Our work offers an approach to selectively filter the incident acoustic vortex, which improves the capability to control the acoustic OAM via metasurfaces.
合写作者：Zhixiang Li,Kai Guo
第一作者：Liulin Li
论文类型：期刊论文
通讯作者：Bingyi Liu,Zhongyi Guo
文献类型：J
卷号：124
期号：1
页面范围：011702
是否译文：否
发表时间：2024-01-02
收录刊物：SCI
发布期刊链接：https://pubs.aip.org/aip/apl/article/124/1/011702/2932193/Acoustic-vortex-filter-based-on-tunable