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Wavefront manipulation based on transmissive acoustic metasurface with membrane-type hybrid structure
Jun Lan1, Xiaowei Zhang1, Xiaozhou Liu2
1Key Laboratory of Modern Acoustics, Institute of Acoustics and School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China.
Scientific Reports
|September 23, 2018
Summary
Researchers developed a gradient acoustic metasurface to control sound waves. This novel device achieves high efficiency and full phase control, enabling applications like acoustic cloaking and negative refraction.
Area of Science:
- Acoustics
- Materials Science
- Wave Physics
Background:
- Controlling acoustic wavefronts is crucial for advanced acoustic devices.
- Metasurfaces offer a promising platform for manipulating sound waves due to their subwavelength structures.
Purpose of the Study:
- To design and demonstrate a gradient acoustic metasurface for transmissive wavefront manipulation.
- To achieve high transmission efficiency and discrete phase shifts over a full 2π range.
Main Methods:
- Fabrication of a gradient metasurface using eight membrane-type hybrid elements.
- Analysis of transmission spectrum and phase gradient using acoustic theory.
- Application of generalized Snell's law for wavefront manipulation.
Main Results:
- Simultaneous achievement of high transmission efficiency and discrete phase shifts.
- Demonstration of wavefront manipulations including anomalous refraction, acoustic cloaking, self-bending beams, and negative refraction.
- Metasurface elements with thickness and width of ~1/5 and ~1/20 of the incident wavelength.
Conclusions:
- The designed gradient acoustic metasurface effectively manipulates transmissive wavefronts.
- The metasurface exhibits potential for developing low-loss acoustic devices.
- This work advances the field of acoustic wave control using engineered metamaterials.
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