Abstract
We report an artificial acoustic compressibility-near-zero medium made of a phononic crystal composed of epoxy blocks arranged in a square lattice. Its anisotropic effective density leads to a linear cross in its isofrequency contour in the vicinity of the Brillouin zone center, as its effective compressibility approaches zero. When a Gaussian beam is normally incident on the phononic crystal, a splitting effect is achieved at the frequency of the crossing point. Based on such a beam-splitting effect, an acoustic cloaking of an irregular-shaped object embedded in the phononic crystal is demonstrated both theoretically and experimentally. Such an anisotropic zero-index material offers a potential method to control acoustic waves.
| Original language | English (US) |
|---|---|
| Journal | Physical Review Applied |
| Volume | 17 |
| Issue number | 5 |
| DOIs | |
| State | Published - May 16 2022 |
Bibliographical note
KAUST Repository Item: Exported on 2022-05-18Acknowledged KAUST grant number(s): OSR-CRG2020-4374, BAS/1/1626- 01-01
Acknowledgements: We thank Juan Song, Fengqing Yang and Hua Ding for assisting with the experiments. This work is partially supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No. OSR-CRG2020-4374 and the KAUST Baseline Research Fund under No. BAS/1/1626- 01-01. Z. Guo, H. Jiang, and H. Chen are supported by the National Key R&D Program of China (Grant No. 2021YFA1400602), the National Natural Science Foundation of China (NSFC) (Grants No. 12004284 and No. 61621001), the Fundamental Research Funds for the Central Universities (Grant No. 22120210579). Open access publication funded by King Abdullah
University of Science and Technology.
ASJC Scopus subject areas
- General Physics and Astronomy