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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Published on: June 7, 2019

Programmable Acoustic Metasurfaces.

Zhenhua Tian¹, Chen Shen², Junfei Li²

¹Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708, USA.

Advanced Functional Materials

|May 25, 2019

Summary

This summary is machine-generated.

This study introduces a programmable acoustic metasurface with tunable unit cells for versatile sound wave manipulation. This breakthrough overcomes limitations in reconfigurability for advanced acoustic applications.

Keywords:

acoustics metamaterials metasurface wave manipulation

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Area of Science:

Acoustics
Materials Science
Wave Engineering

Background:

Metasurfaces offer advanced wave engineering capabilities using subwavelength structures.
Current acoustic metasurfaces lack reconfigurability, limiting their functional versatility.
Achieving on-demand, distinct acoustic functions remains a significant challenge.

Purpose of the Study:

To develop a programmable acoustic metasurface with enhanced reconfigurability.
To enable versatile two-dimensional acoustic wave manipulation.
To overcome the limitations of fixed-function acoustic metasurfaces.

Main Methods:

Designed a metasurface with an array of tunable subwavelength unit cells.
Each unit cell incorporates a straight channel and five shunted Helmholtz resonators.
A fluidic system dynamically tunes the effective mass of the resonators.
Achieved continuous modulation of acoustic wave phase and amplitude.

Main Results:

Demonstrated dynamic and continuous control over acoustic wave transmission.
Successfully engineered versatile wave manipulation functions at the subwavelength scale.
Experimentally verified functions including acoustic wave steering, beam engineering, and energy flow control.

Conclusions:

The programmable acoustic metasurface overcomes reconfigurability limitations.
The device enables versatile 2D acoustic wave manipulation.
Potential applications include acoustic imaging, communication, and acoustic manipulation devices.