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Directional sound beam emission from a configurable compact multi-source system
Jiajun Zhao1,2, Rasha Al Jahdali1, Likun Zhang3
1King Abdullah University of Science and Technology (KAUST), Division of Computer, Electrical and Mathematical Sciences and Engineering, Thuwal, 23955-6900, Saudi Arabia.
Scientific Reports
|January 20, 2018
Summary
This study demonstrates highly directional sound beams using a subwavelength enclosure around monopole sources. This breakthrough improves directivity for miniaturized acoustic systems, enabling precise beam forming and collimation.
Area of Science:
- Acoustics
- Wave physics
- Metamaterials
Background:
- Subwavelength acoustic systems typically exhibit poor directivity, emitting sound omnidirectionally.
- Achieving focused or directional sound beams from small-scale sources is a significant challenge in acoustics.
Purpose of the Study:
- To develop a method for efficient emission of highly directional sound beams from multiple monopole sources within a subwavelength enclosure.
- To overcome the inherent limitations of poor directivity in miniaturized acoustic devices.
Main Methods:
- Embedding multiple monopole sources within a subwavelength enclosure with anisotropic properties.
- Leveraging degenerate Mie resonances within the enclosure to control sound wave interference.
- Utilizing numerical simulations to analyze sound emission patterns and directivity.
Main Results:
- Demonstrated the formation of highly directed sound beams, exhibiting unidirectional or bidirectional patterns.
- The enclosure significantly enhances directivity compared to sources without an enclosure.
- The radiation pattern is controllable by the configuration of sources within the enclosure.
Conclusions:
- The proposed scheme effectively solves the poor directivity problem in subwavelength sound systems.
- This method provides a pathway for beam forming and collimation using miniaturized acoustic devices.
- The findings have implications for advanced acoustic applications requiring precise sound control.
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