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Broadband Focusing Acoustic Lens Based on Fractal Metamaterials
Gang Yong Song1, Bei Huang1, Hui Yuan Dong1,2
1State Key Laboratory of Millimeter Waves, Department of Radio Engineering Southeast University, Nanjing 210096, People's Republic of China.
Scientific Reports
|October 27, 2016
Summary
Researchers developed novel fractal acoustic metamaterials offering low loss and high refractive indices. These broadband materials enable advanced applications like super-resolution imaging and acoustic tunneling.
Area of Science:
- Acoustics
- Materials Science
- Wave Physics
Background:
- Acoustic metamaterials manipulate sound via engineered properties.
- Existing designs often face limitations in loss and refractive index.
- Locally resonant elements are a common, but not the only, approach.
Purpose of the Study:
- To introduce a new class of acoustic metamaterials using fractal geometry.
- To achieve low loss and high refractive indices simultaneously.
- To demonstrate the potential for broadband acoustic manipulation.
Main Methods:
- Designing acoustic metamaterial elements with fractal geometry.
- Leveraging self-similar properties for broadband response.
- Fabricating and experimentally verifying a flat acoustic lens.
Main Results:
- The fractal geometry enables acoustic metamaterials with low loss and large refractive indices.
- Broadband acoustic responses were observed across a wide frequency range.
- The experimental flat acoustic lens demonstrated excellent focusing from 2 kHz to 5 kHz.
Conclusions:
- Fractal geometry offers a promising route for advanced acoustic metamaterials.
- These materials show potential for applications like super-resolution imaging and acoustic tunneling.
- Experimental validation confirms the effectiveness of the proposed fractal acoustic lens.
