Chinese Physics B, Volume. 29, Issue 10, (2020)
Measuring orbital angular momentum of acoustic vortices based on Fraunhofer’s diffraction
Acoustic vortex (AV) beam is triggering the significant research interest in information and communication sciences due to its infinite and mutual orthogonal orbital angular momentums (OAMs). Therefore, measuring the topological charges of an AV beams become a task with great significance. In this work, we present a Fraunhofer diffraction (FD) pattern of an AV beam that can be used to quantitatively detect the OAMs of AV beams. We both theoretically and numerically investigate the FD patterns of AV beams passing through a multipoint interferometer (MPI). It is demonstrated that the topological charges of the AV beams can be determined from the interference intensity patterns. The proposed method may pave the way to the practical applications of AV beams.
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Chao-Fan Gong, Jing-Jing Li, Kai Guo, Hong-Ping Zhou, Zhong-Yi Guo. Measuring orbital angular momentum of acoustic vortices based on Fraunhofer’s diffraction[J]. Chinese Physics B, 2020, 29(10):
Received: Feb. 27, 2020
Accepted: --
Published Online: Apr. 21, 2021
The Author Email: Zhou Hong-Ping (guozhongyi@hfut.edu.cn)