Abstract
The self-collimation effect of acoustic waves is a unique acoustic transmission phenomenon in two-dimensional (2D) phononic crystals (PCs), which has broad application prospects in acoustic wave regulation. In this paper, a sonic demultiplexer based on the self-collimation characteristics of 2D PCs is proposed. The sonic demultiplexer, which is composed of three Mach–Zehnder interference structures in 2D PCs, can demultiplex the incident acoustic waves that contain multiple frequencies. Moreover, the frequencies of the incident sound beams can be manipulated by adjusting the internal parameters of the demultiplexer. Potential applications include acoustic communication and acoustic signal processing, especially in underwater circumstances.
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