Fig. 1. (a) Top view and (b) side view of bilayer graphene cell (marked as blue) doped with nickel (marked as green); (c) top view and (d) side view of trilayer graphene cell (marked as blue) doped with nickel (marked as green).镍原子掺杂的双层石墨烯的(a)俯视图和(b)侧视图; 镍原子掺杂的三层石墨烯的(c)俯视图和(d)侧视图(蓝色代表石墨烯, 绿色代表镍原子)

Fig. 2. Energy band diagram for (a) bilayer graphene, (b) Ni-doped bilayer graphene, (c) trilayer graphene, (d) Ni-doped trilayer graphene.能带图　(a)双层本征石墨烯; (b)镍掺杂双层石墨烯; (c)三层本征石墨烯; (d)镍掺杂三层石墨烯

Fig. 3. Density of states diagram for (a) bilayer graphene (D), (b) trilayer graphene (T), (c) Ni-doped bilayer graphene (D-Ni), (d) Ni-doped trilayer graphene (T-Ni).DOS　(a)双层本征石墨烯(D); (b)三层本征石墨烯(T); (c)镍掺杂双层石墨烯(D-Ni); (d)镍掺杂三层石墨烯(T-Ni)

Fig. 4. Dielectric constant of the Ni-doped bilayer graphene and bilayer graphene.镍原子掺杂前后的双层石墨烯的介电常数

Fig. 5. Refractive index versus wavelength for the Ni-doped bilayer graphene and pure bilayer graphene.双层石墨烯掺杂前后的折射率与波长的关系

Fig. 6. Comparison of reflectivity of monolayer, bilayer and trilayer graphene with and without Ni doping.掺杂前后的单层、双层和三层石墨烯的反射率