Aerogel-based metasurfaces for perfect acoustic energy absorption
arXiv:1906.04496 · doi:10.1063/1.5109084
Abstract
The unusual viscoelastic properties of silica aerogel plates are efficiently used to design subwavelength perfect sound absorbers. We theoretically, numerically and experimentally report a perfect absorbing metamaterial panel made of periodically arranged resonant building blocks consisting of a slit loaded by a clamped aerogel plate backed by a closed cavity. The impedance matching condition is analyzed using the Argand diagram of the reflection coefficient, i.e., the trajectory of the reflection coefficient as a function of frequency in the complex plane. The lack or excess of losses in the system can be identified via this Argand diagram in order to achieve the impedance matching condition. The universality of this tool can be further exploited to design more complex metasurfaces for perfect sound absorption, thus allowing the rapid design of novel and efficient absorbing metamaterials.
References in corpus (7)
- Reverse Doppler Effect of Sound
- Optimal Sound Absorbing Structures
- Ultra-thin metamaterial for perfect and omnidirectional sound absorption
- Subwavelength total acoustic absorption with degenerate resonators
- Quasi-perfect absorption by sub-wavelength acoustic panels in transmission using accumulation of resonances due to slow sound
- Broadband quasi perfect absorption using chirped multi-layer porous materials
- Bright and Gap Solitons in Membrane-Type Acoustic Metamaterials