I'm just getting done the finishing touches on this technological monstrosity known as a 'Zone Plate Battery', which functions as both an anti aircraft defense system, and a long range surveillance system.
In Archon Defender, a zone plate acts as a type of resonator, focusing and amplifying energy
In reality, zone plates actually exist. They focus light based on the quantum principle of diffraction, and are used to focus microwaves and xrays, wavelengths of the electromagnetic spectrum which cannot be focused with lenses.
Of course, once I found out about them, I simply had to put one in my film ;)
Read more about zone plates on Wikipedia.