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Random versus regular square lattice experimental comparison for a subwavelength resonant metasurface
1University Grenoble Alpes, University Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, 38000 Grenoble, France.
The Journal of the Acoustical Society of America
|July 9, 2021
Summary
This study compares random and regular aluminum metasurfaces. Regular lattices exhibit unique Fano resonance and pseudo bandgaps, unlike random ones which show broad bandgaps for acoustic waves.
Area of Science:
- Acoustic Metamaterials
- Solid Mechanics
- Wave Physics
Background:
- Subwavelength metasurfaces offer unique wave manipulation capabilities.
- Aluminum beam resonators provide a platform for exploring acoustic phenomena.
Purpose of the Study:
- To experimentally compare the acoustic properties of random and regular aluminum metasurfaces.
- To investigate the influence of resonator arrangement on wave propagation and bandgap formation.
Main Methods:
- Fabrication and experimental testing of two aluminum metasurfaces with random and regular beam arrangements.
- Numerical simulations for comparison with experimental data.
- Coherent and incoherent signal analysis to characterize scattering regimes.
Main Results:
- The random metasurface exhibited a wide full bandgap for the A0 Lamb mode.
- The regular metasurface displayed Fano resonance and Bragg scattering, creating anisotropy and a pseudo bandgap.
- Both metasurfaces showed multimodal response leading to double negativity and pseudo bandgaps.
Conclusions:
- Resonator arrangement significantly impacts the acoustic performance of metasurfaces.
- Regular lattices can induce complex phenomena like Fano resonance and pseudo bandgaps, offering tunable wave control.
- Experimental results align well with numerical simulations, validating the models.
