Figure 3

Normalized intensity maps for the three-designed waveguides (normalized by maximum transmitted intensity for each simulation box). The white points represent the 5.5-mm-diameter beams of the cluster, and the black points indicate the 5.2 mm (a), the 5.3 mm (b), and the 5.4 mm (c) diameter beams of the central line. From top to bottom (a–c): increasing the beam diameter of the central line increases the frequency of the flexural resonance and tunes the leakage through the beam cluster.