角动量
传输(电信)
有损压缩
物理
光学
散射
话筒
反射(计算机编程)
声学
经典力学
电信
计算机科学
声压
人工智能
程序设计语言
作者
Jun Ji,Junfei Li,Nikhil JRK Gerard,Xiuyuan Peng,Steven A. Cummer,Yun Jing
出处
期刊:Journal of the Acoustical Society of America
[Acoustical Society of America]
日期:2023-03-01
卷期号:153 (3_supplement): A120-A120
摘要
Wave fields with acoustic orbital angular momentum have drawn greatattention because of its wide range of applications such as acoustic communication and particle manipulation. We designed, fabricated, and experimentally validated a type of lossy metasurface which enables an extremely selective transmission of acoustic wave filed depending on the chirality of its orbital angular momentum. The metasurface is composed of a phase gradient metagrating (PGM) and microperforated panel (MPP). By harnessing the multiple internal reflection of PGM and the carefully engineered loss of MPP, the left-handed incident vortex has a near-zero power transmission while its right-handed counterpart has a 60% power transmission. Such an extremely selective transmission was experimentally validated by retrieving the full scattering matrix using a generalized twelve-microphone method, which shows a good agreement with numerical simulations.
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