Fig. 3
Model and properties of the grating layer. a Model for grating layer. Geometrical parameters are: w1 = 1.25 mm, w2 = 6.95 mm, L = 18.75 mm. Changing the grating period d2 will results in different kG. We choose d2 = 18.9 mm for kG = 2k0 (grating1), d2 = 12.6 mm for kG = 3k0 (grating2), and d2 = 9.4 mm for kG = 4k0 (grating3). b, c Amplitudes (b) and phases (c) of theoretical and simulated transmission coefficients of grating layers in the transmitter. d, e Amplitudes (d) and phases (e) of theoretical and simulated transmission coefficients of grating layers in the receiver
