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Fig. 2 | PhotoniX

Fig. 2

From: Manipulating light transmission and absorption via an achromatic reflectionless metasurface

Fig. 2

Generic phase diagram for the bi-layer metasurfaces. a Reflectance of the 2-mode 2-port model (inset) calculated by Eq. (3) in the main text, as a function of frequency, θX and κ, with κ − Im(X) = 0 satisfied on the horizontal curved surface. Green dash lines labeled with #1 to #4 represent the cases of κ/Γr = 1, 0, − 0.6, − 1 with fixed θX = π/2, while those labeled with #4 to #7 represent the cases of θX = π/2, 3π/5, 3π/4, π with κ − Im(X) = 0 satisfied, respectively. Here, Γr/f0 = 0.2. b-c Calculated reflection spectra |r|2 and those contributed by two decoupled modes |r±|2 calculated by Eq. (3) for 6 systems corresponding to 6 dashed lines shown in a. d Upper panel: spectra of |r|2 and |r±|2 calculated by Eq. (3) for the #4 system; Lower panel: computed spectra of transmittance and transmission phase for the #4 system

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