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(a) Cross-sectional view of transmissive grating unit cell; (b) reflectance and transmittance vs. angle of TE-polarized electromagnetic wave incidence α at λ = 625 nm, n1 = 1.0, n2 = n4 = nL1 =2.5884, n3 =1.7, nL2 =1.7663, n5 = 1.4572 for TiO2 transmissive grating with such parameters: w1 = 60 nm, w2 =120 nm, h1 = 170 nm, h2 = 130 nm, HL3 = 0 nm, dr=-5 nm, HL1 = HL2 = 5 nm.
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