Space-time acoustic coding metasurfaces with scattering reduction characteristics
Sheng He, Wenkang Cao, Kaiping Nie, Jinsong Ye, Jie Hu, Liting Wu
TL;DR
This paper introduces a new type of metasurface that can reduce sound scattering in 3D space by manipulating acoustic waves using time-modulation strategies.
Contribution
The novel contribution is the development of space-time acoustic coding metasurfaces (STAMs) with scattering reduction capabilities through harmonic manipulation.
Findings
STAMs can reduce sound pressure levels by about 22 dB compared to traditional acoustic coding metasurfaces.
The proposed STAM unit cells maintain a 180° phase difference at the operation frequency by varying acoustic impedance.
The space-time modulation mechanism enables flexible acoustic wavefront manipulation for applications like noise control and acoustic stealth.
Abstract
In recent years, constructing space-time joint modulation acoustic metasurfaces with harmonic manipulation capabilities to achieve excellent scattering reduction within three-dimensional (3D) space has remained a significant challenge. Here, space-time acoustic coding metasurfaces (STAMs) with harmonic manipulation in 3D space are demonstrated, which consist of two types of sub-wavelength unit cells. By changing acoustic impedance of proposed unit cells, the phase difference between these unit cells can maintain 180° in the operation frequency. Both theoretical calculations and numerical simulations verified that compared with acoustic coding metasurfaces of the same size with spatial coding sequence M1(0000 …), the maximum sound pressure level (SPL) of the STAM can decrease about 22 dB. The proposed space-time joint modulation mechanism can provide a method for achieving flexible…
Genes, proteins, chemicals, diseases, species, mutations and cell lines named across the full text — each resolved to its canonical identifier and authoritative record.
Click any figure to enlarge with its caption.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
Taxonomy
TopicsAcoustic Wave Phenomena Research · Antenna Design and Analysis · Metamaterials and Metasurfaces Applications