Fig. 3
Absorption spectra of the PIT system in the wavelength scale as functions of (a), (b) the ribbon width Wr of LGNRs; (c, d) the DG width Wd of UGGs; and (e, f) the separation distance d between the two graphene layers with a step of 10/20 nm at polarization angles of θ = 0° (a, c, e) and 90° (b, d, f), respectively. In (a–f), the deeper red color in the solid lines denotes a stronger absorption. Note that some of the lines are cut to avoid distractions from other higher-ordered absorption peaks. In (e) and (f), solid curves and dark circles present the numerical and theoretical results, respectively. SM and AM refer to the symmetric mode and antisymmetric mode, respectively