  We study the Aharonov-Bohm caging effect in a one-dimensional lattice of
theta-shaped units defining a chain of interconnected plaquettes, each one
threaded by two synthetic flux lines. In the proposed system, light trapping
results from the destructive interference of waves propagating along three
arms, this implies that the caging effect is tunable and it can be controlled
by changing the tunnel couplings $J$. These features reflect on the diffraction
pattern allowing to establish a clear connection between the lattice topology
and the resulting AB interference.
