  Transition metal dichalcogenides (TMDCs) exhibit high second harmonic (SH)
generation in the visible due to their non-centrosymmetric crystal structure in
odd-layered form and direct bandgap transition when thinned down to a
monolayer. In order to emit the SH radiation into a desired direction one
requires a means to control the phase of the in-plane nonlinear polarization.
Here, we couple the SH response of a monolayer MoS$_{\text{2}}$ to an optical
phased array antenna and demonstrate controllable steering of the nonlinear
emission. By exploiting the intrinsic SH generation by the phased array antenna
we achieve uniform emission efficiency into a broad angular range. Our work has
relevance for novel optoelectronic applications, such as programmable optical
interconnects and on-chip LIDAR.
