Figure 4
From: A Low-loss Metasurface Antireflection Coating on Dispersive Surface Plasmon Structure
Colormaps of amplitude and phase AR-conditions around the first-order SPP resonance wavelength.
Difference in amplitudes of reflection coefficients, 
and the phase term, θ = ϕ(r12) − ϕ(α · r23) − 2β with (a,b) various BCB thicknesses and (c,d) MDA sizes, respectively.
