Cao Wen-Kang, Wu Li-Ting, Zhang Cheng, Ke Jun-Chen, Cheng Qiang, Cui Tie-Jun, Jing Yun
State Key Laboratory of Millimeter Waves, Department of Radio Engineering, Southeast University, Nanjing 210096, China.
State Key Laboratory of Millimeter Waves, Department of Radio Engineering, Southeast University, Nanjing 210096, China.
Sci Bull (Beijing). 2019 Jun 30;64(12):808-813. doi: 10.1016/j.scib.2019.01.002. Epub 2019 Jan 6.
We demonstrate that asymmetric acoustic wave transmission in a waveguide can be achieved via gradient index metamaterials (GIMs). We theoretically prove that the acoustic wave can be efficiently converted to surface waves (SWs) via GIMs. The GIMs in a waveguide can allow the transmission of acoustic waves in one direction but block them in the other direction. This theory is validated by experiments. Our findings may provide new applications in various scenarios such as high-efficiency acoustic couplers and noise control.
我们证明，通过梯度折射率超材料（GIMs）可以在波导中实现非对称声波传输。我们从理论上证明，声波可以通过GIMs有效地转换为表面波（SWs）。波导中的GIMs可以允许声波在一个方向上传输，而在另一个方向上阻挡它们。这一理论通过实验得到了验证。我们的发现可能会在各种场景中提供新的应用，如高效声耦合器和噪声控制。
