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Research Article

Tunable Fluid-Type Metasurface for Wide-Angle and Multifrequency Water-Air Acoustic Transmission

Figure 6

The application in enhancing the acoustic signal across the water-air interface. (a) The schematic diagram that an in-air loudspeaker might replace the expensive underwater speaker with the FAM. (b) The underwater speaker might work with a low power to emit the music from water to air with the FAM. (c) The experiment setup to demonstrate the FAM can enhance the music signal transmission across the water-air interface. (d) The received music signal from water to air with and without the FAM. The color from blue to pink exhibits the increase of the amplitude of acoustic pressure. It suggests that the fundamental frequencies of the music signal are enhanced with the FAM. (e) The acoustic pressure of the received music signal with and without the FAM.