Figure 1

The geometry of the studied system: a periodic array of graphene microribbons of width $W$ and period $L$, with a normally incident electromagnetic wave having the magnetic field along the ribbons. The array is placed between two dielectric half spaces with dielectric constants ${\varepsilon }_1$ and ${\varepsilon }_2$.Reuse & Permissions

Figure 2

Absorption and gate-induced change of transmission spectra for PAGR with the dielectric cladding and relaxation time corresponding to the experiment in Ref. 21: ${\varepsilon }_1=3$, ${\varepsilon }_2=4$, $\tau =0.25$ ps. (a) shows the absorption spectra $A$ for different values of chemical potential $\mu$. The continuous curves are for the period $L=8\mu$m, while the discontinuous ones are for $L=4\mu$m. For both cases $W=L/2$. In the inset the relative change of transmission with respect to the sample at charge neutral point $\delta T=-(T-T_{\mathrm{CNP}})/T_{\mathrm{CNP}}$ is shown for the same $L$ and $W$ as in the main figure. In (b) the spectra for $A$ (continuous curves) and $\delta T$ (discontinuous curves) are shown for different widths of the ribbons $W$ for $L=8\mu$m, $\mu =0.2$ eV. The case of $W=4\mu$m is also shown for the freestanding graphene (${\varepsilon }_1={\varepsilon }_2=1$).Reuse & Permissions

Figure 3

Absorption $A$ [in panels (a), (c), (e)], reflection $R$ and transmission $T$ [in panels (b), (d), (f)] spectra for freestanding periodic array of graphene ribbons with different values of ribbon width $W$ and relaxation times $\tau$. Panels (a)–(b), (c)–(d), and (e)–(f) correspond to $W=0.8$, 4, and $7.2$ $\mu$m, respectively; in all cases the period is $L=8$ $\mu$m. The inset to (b) represents the color plots for the electric field modulus $\left|\mathbf{E}\right|$ and the real part of the $y$ component of the electric field $E_y$ in the vicinity of the ribbon. The color plots are marked with respect to the numeration of the peaks in panel (a). The inset to (d) shows the dependencies of the maximum values of $A$ and $R$ and the minimum value of $T$ as a function of $\tau$, for longest-wavelength resonance shown in (c)–(d). The horizontal discontinuous line in the inset sets the maximal possible value of $A$. The dotted lines in panels (a), (c), (e) represent the absorption by a continuous graphene sheet.Reuse & Permissions