Figure 6

The magnitudes of the electric field \(|{\textbf {E}}_{\pm }|\) represented across the longitudinal direction z/D when the structure is illuminated from different sides: \(|{\textbf {E}}_{+}|\) is the signal when the left port is excited while \(|{\textbf {E}}_{-}|\) expresses the response when the right port is excited (arrows indicate the side of illumination). The thickness of the setup is selected so that \(|\Delta \tau |\) is maximized: (a) \(N=5\), \(D = 2.10\lambda\), (b) \(N=10\), \(D = 4.42\lambda\). Rest of plot parameters same as in Fig. 3.