Figure 1: Schematic illustration of sound insulation by manipulating the wave vector of incident wave. | Scientific Reports

Figure 1: Schematic illustration of sound insulation by manipulating the wave vector of incident wave.

From: Sound Insulation in a Hollow Pipe with Subwavelength Thickness

Figure 1

(a) The anomalous reflection on the upper boundary that bends the propagation direction of grazing-incidence wave by approximatelyπ/2. (b) The anomalous reflection on the bottom boundary that eventually reverses the direction of incident wave. (c,d) Scattered sound pressure field of the anomalous reflection for (c) grazing incidence and (d) vertical incidence in the condition of effective parameters model. Propagation direction of scattered wave is marked by white arrows.

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