13 May 2015 Parameter-dependence of the acoustic rotation effect of a metamaterial-based field rotator (Presentation Video)
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The field rotator is a fascinating device capable to rotate the wave front by a certain angle, which can be regarded as a special kind of illusion. We have theoretically designed and experimentally realized an acoustic field rotator by exploiting acoustic metamaterials with extremely anisotropic parameters. A nearly perfect agreement is observed between the numerical simulation and experimental results. We have also studied the acoustic property of the acoustic rotator, and investigated how various structural parameters affect the performances of such devices, including the operating frequency range and rotation angle, which are of particularly significance for the application. The inspection of the operating frequency range shows the device can work within a considerably broad band as long as the effective medium approximation is valid. The influence of the configuration of the metamaterial unit has also been investigated, illustrating the increase of anisotropy of metamaterial helps to enhance the rotator effect, which can be conveniently attained by elongating each rectangle inserted to the units. Furthermore, we have analyzed the underlying physics to gain a deep insight to the rotation mechanism, and discussed the application of such devices for non-plane wave and the potential of extending the scheme to three-dimensional cases. The realization of acoustic field rotator has opened up a new avenue for the versatile manipulations on acoustic waves and our findings are of significance to their design and characterization, which may pave the way for the practical application of such devices.
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Xue Jiang, Xue Jiang, JianChun Cheng, JianChun Cheng, Bin Liang, Bin Liang, "Parameter-dependence of the acoustic rotation effect of a metamaterial-based field rotator (Presentation Video)", Proc. SPIE 9438, Health Monitoring of Structural and Biological Systems 2015, 94380Z (13 May 2015); doi: 10.1117/12.2084578; https://doi.org/10.1117/12.2084578

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