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(a) The geometric configuration of the model. The gradually varying color indicates the distribution of the sound speed. (b) The schema that depicts the asymmetric wave trajectory. (c) The asymmetric wave trajectory derived by numerically solving Eq. (2).
(a) A sketch of the structure utilizing PC-based metamaterials. (b) The first 51 points denote the radii of cylinders in each layer that is parallel to the left boundary in the first and second part of the structure. The last 7 points denote the radii of cylinders in each vertical layer in the third part of the structure. (c) The effective sound speed distribution (along the horizontal line y = 0.2) of the PC-based structure derived by effective medium theory.
Acoustic intensity distributions at the frequency of 4500 Hz. (a) and (b) are the PI and NI performance of the PC-based structure. (c) and (d) are the corresponding intensity field of the EMT-based model. The arrows in the figures indicate the directions of incident waves.
The frequency dependence of transmission coefficients along the opposite directions. (a) The case of PC-based implementation. (b) The case of the corresponding EMT-based model.
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