Fig. 2: Double coupled waveguides (DCWs) for demonstrating chiral transmission of asymptotic modes.
From: Chiral transmission by an open evolution trajectory in a non-Hermitian system
a DCWs and adiabatic couplers. W1,2 is the width of the first and second waveguide, and d is the gap distance between them. The DCWs are marked by the dashed rectangle. Ports Ι and ΙΙ correspond to the first and second waveguides, respectively. The blue line with arrows in the right panel shows the evolution trajectory, where its projection onto (β ⁄ κ, γ ⁄ κ) plane is marked by the yellow line. b, c Simulated field distribution of Ex when the light is injected into port Ι from the left side (b) and from the right side (c) at 1550 nm
