Enhanced and directional water wave emission by embedded sources

We theoretically investigate the emission of a point source placed inside a square array of rigid cylinders standing in water. It is shown that a highly directional water wave source can be realized at the band-edge frequency. The angular distribution and signal strength of the emission field depend strongly on the position of the point source relative to the unit cell within which it is placed. Highly directional emission field with half-power angular width of only 8° can be obtained by a simple realization.