| Issue |
EPL
Volume 147, Number 6, September 2024
|
|
|---|---|---|
| Article Number | 66001 | |
| Number of page(s) | 6 | |
| Section | Condensed matter and materials physics | |
| DOI | https://doi.org/10.1209/0295-5075/ad7057 | |
| Published online | 30 September 2024 | |
Broadband seismic cloaks based on gradient index metamaterial
1 School of Mathematics and Physics, China University of Geosciences - Wuhan 430074, China
2 School of Aerospace Engineering, Huazhong University of Science and Technology - Wuhan 430074, China
Received: 27 March 2024
Accepted: 16 August 2024
In this work, we propose two gradient index seismic metamaterials (GRIN SMs) for realizing the directional cloaks composed of blind holes with varying radii in a semi-infinite soil substrate for seismic Rayleigh waves. The results demonstrate that the designed cloaks can transfer more than 50% of the incident wave energy before it reaches the target buildings. More importantly, the designed cloaks have the property of wide working bandwidth from 6 Hz to 12 Hz. At certain frequencies, the attenuation of incident waves by the cloak can reach 80%. Moreover, one of cloaks composed of four Luneburg lens can achieve a multi-directional seismic cloak.
© 2024 EPLA
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