Fig. 5: Experimental front propagation in two-dimensional bistable lattice systems.
From: Nonlinear wave propagation in a bistable optical chain with nonreciprocal coupling
a Square lattice of bistable optical cells with reciprocal coupling. b Square lattice of bistable optical cells with non-reciprocal coupling. a1 and b1 show the initial conditions \({t}_{1}={t}_{1}^{{\prime} }=0\) s. a2 and b2 show the final states t2 = 2.52 s and \({t}_{2}^{{\prime} }=5.08\) s. The arrows account for the propagation speed in the respective direction. The distance between cells is indicated by the scale bar.
