Figure 9

Interference patterns for beam steering: (a) \(V_1=1\) V, \(V_2=2\) V, \(V_3=V_4=0\), (b) \(V_3=1\) V, \(V_4=2\) V, \(V_3=V_4=0\), and (c) \(V_1=1.5\) V, \(V_2=0\) V, \(V_3=1\) V, \(V_4=2\) V. Measured beam steering towards the (d, e) horizontal and (f, g) vertical direction.