Figure 3 | Scientific Reports

Figure 3

From: Subwavelength acoustic monopole source emission enhancement through dual gratings

Figure 3

(a) Design of a one-layer enclosure, it is constructed by removing the outer ring of the two-layer enclosure and keeping the inner ring. (b) The acoustic Purcell factor (black solid curve) by a line source located at the center of the one-layer enclosure, and the Purcell factor predicted by the effective medium theory (red dashed curve). As a comparison, the Purcell factor for the two-layer enclosure is plot as the blue dotted curve. (c) Near-field intensity distribution of the pressure wave at 11300 Hz, where the wave energy is mostly localized inside the central cavity.

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