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Schematic view of the phononic crystal with two waveguides coupled through an element constituted by two cavities constituted by two vacancies (represented by dotted squares). Stubs along the guides ensure the efficiency of the coupling. The extremities of the two waveguides are labeled as ports 1–4.
Calculated transmission spectra: (a) through a straight wave guide in the phononic crystal, in the frequency range of the absolute band gap (from and ); (b) through a straight waveguide when a stub is inserted at the side of the guide; (c) for a single cavity inside the crystal.
Numerical transmission spectra at the output ports 2, 3, and 4 for an input Gaussian excitation coming from port 1. At a frequency of , the incident wave drops from the first to the second waveguide.
Calculated displacement field along the direction of propagation at a frequency of , averaged over one period of oscillation. The red color (respectively, blue) corresponds to the highest (respectively, lowest) value of the displacement field given in arbitrary units.
Experimental transmission spectra for the phononic crystal at the output ports 2 and 3. The channel drop process from port 1 to 3 is observed at as predicted numerically.
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