Journal
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
Volume 33, Issue 24, Pages -Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0217979219502734
Keywords
Broadband; reprogrammable acoustic metasurface; tunable; cloaking; disguising
Funding
- Project of National Natural Science Foundation of China [51675402, 51275377]
- National Basic Research Program of China [2011CB610306]
- China Postdoctoral Science Foundation [2018M643623]
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Narrow bandwidth and specific incident angle are the main drawbacks in real-life applications for the existed carpet cloaking based on the acoustic metasurface (AM). Here, we tackle to get over the problems by proposing a reprogrammable AM. The unit cell is composed of water sink and filling nozzle. By incorporating an external water pumping system into each individual unit cell, the reflected phase can be readily regulated. Since the pumping process is reversible, the AM is reprogrammable under the control of the water pumping system in the frequency range of 3430-6860 Hz. Both the acoustic cloaking and disguising are designed based on the proposed AM. The double security for the target object can be ensured to avoid being detected by combining the two designs. Simulated results with the finite element method indicate that the acoustic cloaking and disguising can work in the broad bandwidth of 66.7% of the central frequency with full-range incident angles from to -90 degrees to 90 degrees. Our design shows promise for applications in realizing the practical skin cloaking and disguising one step closer.
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