Fig. 6
a The spectral transmittance with refractive index n = 1, 1.02, 1.04, and 1.06; b the peak/dip wavelengths of the spectral transmittance versus the refractive index n. The parameters are set as W = 800 nm, L = 620 nm, d = 20 nm, W U = 150 nm, L U = 120 nm, L 1 = 220 nm, L 2 = 250 nm, L r = 50 nm, W r = 96 nm, τ = 1 ps, μ c1 = 0.3 eV, and μ c2 = 0.9 eV