Figure 1
From: Absence of Exceptional Points in Square Waveguide Arrays with Apparently Balanced Gain and Loss
Schematics of the proposed 3D coupled waveguides and cross section profile.
Schematic figures of the coupled waveguides system composed of double waveguides (a) and four waveguides (d), respectively. (c) and (d) represent the cross sectional view corresponding to (a) and (b) with the following dimensions: R = 0.2 μm and 
 μm. In this configuration, the structure has a high geometrical symmetry.
