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(a) Schematic diagram of the AM structure through coiling up space. Steel plate (gray areas) with width and length is immersed in air (white areas) to form zigzag channels ( ). (b) The simplified model with a straight path filled with an effective medium of high refractive index.
The relative effective refraction index (red circles) and acoustic impedance (blue dots) of (a) the AM structure and (b) the simplified mode as a function of , respectively. (c) The power transmission spectra of the AM structure (black line) and the simplified model (red dots).
The spatial distribution of the pressure amplitude field of (a) the AM structure and (b) the simplified model, respectively. Green arrows indicate the propagation directions.
The power transmission spectrum of the AM structure as a function of the incident angle .
The power transmission spectra of the AM structure as a function of (a) the width of the channels, (b) the thickness of the AM structure , and (c) the height of the channels , respectively.
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