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Generation of acoustic vortex beams with designed Fermat's spiral diffraction grating
Hongping Zhou1, Jingjing Li1, Kai Guo1
1School of Computer and Information, Hefei University of Technology, Hefei, 230009, China.
The Journal of the Acoustical Society of America
|January 3, 2020
Summary
Researchers developed a passive Fermat
Area of Science:
- Acoustics and Wave Physics
- Diffraction and Grating Technology
Background:
- Conventional acoustic vortex generation relies on complex electric manipulation of transducers.
- Passive methods offer a simpler and more compact alternative for acoustic manipulation.
Purpose of the Study:
- To investigate a novel passive method for generating and detecting acoustic vortex beams in water.
- To explore the use of a Fermat's spiral diffraction grating (FSDG) for acoustic vortex generation.
Main Methods:
- Theoretical and numerical investigation of acoustic wave interaction with a passive FSDG.
- Analysis of constructive and destructive interference patterns produced by the FSDG.
- Simulation of acoustic vortex beam generation and detection using the FSDG.
Main Results:
- The FSDG successfully generates acoustic vortex beams through wave interference.
- The topological charge and order of the acoustic vortex can be controlled by FSDG design.
- The same FSDG structure can be used for both generation and detection of acoustic vortices.
Conclusions:
- Passive FSDGs provide an effective and simpler approach for acoustic vortex generation and detection.
- The FSDG's design parameters allow for tunable acoustic vortex properties.
- Potential applications include particle trapping, imaging, and underwater acoustic communication.
