Article
Composite Metasurfaces for Multi-Angle Low-Frequency Absorption (en)
* Presenting author
Abstract:
Development of subwavelength structures for absorption of low-frequency acoustic noise is one of the global challenges of modern engineering acoustics. Recent advances in the field of metameterials demonstrate that the problem can be tackled with ultra-thin metasurfaces. However, the proposed solutions usually demonstrate strong absorption only within a narrow frequency range. To solve this problem, we investigate composite periodic structures consisting of deeply subwavelength resonant elements and porous materials. Such a combination allows to achieve high absorbtion in the range below 500 Hz. Moreover, the system is omnidirectional, meaning that it works for an arbitrary angle of incidence. These findings may become a basis for the development of novel low-frequency absorbers for various indoor applications.