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(a) Schematic diagram of unidirectional acoustic transmission through a prism with near-zero refractive index. (b) Critical angle for acoustic plane waves derived from the slowness surface.
Pressure field pattern of the prism with 45° inclination for (a) PI and (b) NI cases, respectively. Pressure field pattern of the prism with 60° inclination for (c) PI and (d) NI cases, respectively. The green arrows represent for the propagation directions.
(a) Schematic diagram of an individual unit of the coiling-up-space structure. Brass plate with width , and length is immersed in air in a way to form channels with width . (b) The real part of the relative effective mass density (dash line) and the absolute value of the relative effective acoustic velocity (solid line) as functions of normalized frequency. (c) The real part of the relative effective acoustic impedance (dash line) and the power transmission spectrum (solid line) as functions of normalized frequency.
Pressure filed pattern for the coiling-up-space structure for (a)PIand (b) NI cases at , respectively. Pressure filed pattern for (c) PI and (d) NI cases with hard scatterer inserted in the middle of coiling-up-space prism, respectively. The closer view inserted in (b)refers to the microstructure near the prism's edge.
Pressure fields pattern for the (a and b) symmetric cut-off, (c and d) symmetric conduction, (e–h) one-way transmission for RL and LR at , respectively. Pressure fields of the output areas for the coiling-up-space prism are plotted for comparison. The green arrows refer to the incident wave's propagation.
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