Don't forget optical nanoantennas! Essentially a wiggly waveguide- you set up a standing wave inside it and light exits the wiggles at a specific angle, which

Don't forget optical nanoantennas! Essentially a wiggly waveguide- you set up a standing wave inside it and light exits the wiggles at a specific angle, which can be altered by changing the phase of the standing wave. By having hundreds of wiggles you average out the fabrication error in any individual wiggle and produce an extremely controllable beam. Of course they're still working on the coherent part.