4.1.2 Effect of the thickness of superconductor on GTM structure

In this part, the superconductor's thickness is changed by varying the permittivity of its refractive index. Figure 4 shows that a large PBG augments with an

### Figure 4.

The 3D reflectance spectrum through hybrid GTM(m, n) heterostructure at given values of superconductor's thicknesses: ds is set at 20, 40, 60 and 80 nm.

augmentation the thickness. Full gaps were obtained for ds = 80 nm. The amplitude of oscillations around the channels with T = 0 decreases with an increase of ds. Also, a set of peaks is obtained for high values of thickness. Accordingly, the dip of each gap increases when the thickness of YBa2Cu3O7 increases, and the pseudo PBG becomes a gap with zero transmission. This improves the characteristics of channel filters.
