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Simulated normalized pressure field for (a) 1300 Hz (BG0°), (b) 1700 Hz (negative refraction and focalization effect) and (c) 2700 Hz (ABG). Pressure level at the point source (marked by a white “+” sign) is normalized to 1 Pa. Regions where the grayscale is saturated (i.e. normalized pressure magnitude is above 0.25) are shown in black. The position of the pseudo-listener (not used in the simulation, only shown here as a guide for the reader) is indicated with a black “×” sign, and the dashed rectangle indicates the position of the wall for the FS simulation. The arrow in panel b denotes the extension of the focalization region, and the horizontal bar crossing the arrow is vertically aligned with the center of the region, i.e. the point of maximal pressure.
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