Fig. 3: A universal port-to-port router for light.
From: Conservative port-to-port funneling of light in nonlinear photonic lattices
a An optical array with a detuning parameter \(\Delta=0.043\), designed to support funneling dynamics at appropriate power levels. After approximately 50 coupling lengths, the central waveguide exhibits an increased refractive index, collapsing the ground state into a single site. b Port-to-port funneling is demonstrated using the array shown in (a) establishing a universal light router that irreversibly captures power from any input port. Port indices are labeled relative to the designated funneling port (0): positive to the right and negative to the left.
