图  1   a—石墨烯纳米片二聚体的结构及参数  b—模型单元结构图  c~e—石墨烯纳米片二聚体阵列在偏振方向为x的线偏光激发下的法诺共振谱(L₁=70 nm, L₂=40 nm, a=0 nm, E_F=0.5 eV)

Figure  1.   a—structure and parameters of graphene nanosheet heterodimer  b—schematic of each cell unite  c~e—the resonance spectra of the graphene nanosheet heterodimer array excited with x-polarized incident light (L₁=70 nm, L₂=40 nm, a=0 nm, E_F=0.5 eV)

图  2   当L₁=70 nm, L₂=40 nm, a=0 nm, E_F=0.5 eV时，单纳米片和纳米片二聚体在偏振方向为x的线偏光激发下的反射谱

Figure  2.   Reflection spectra of nanosheet and nanosheet heterodimer (L₁=70 nm, L₂=40 nm, a=0 nm, E_F=0.5 eV) excited with x-polarized incident light

图  3   图 2c中4个共振峰对应的表面电荷分布图

a—共振峰1   b—共振峰2   c—共振峰3   d—共振峰4

Figure  3.   Surface charge density distributions of the four hybridized plasmonic modes in Fig. 2c

a—peak 1   b—peak 2   c—peak 3   d—peak 4

图  4   图 2c中4个共振峰对应的电场分布图

a—共振峰1   b—共振峰2   c—共振峰3   d—共振峰4

Figure  4.   Electric field distributions of the four hybridized plamonic modes in Fig. 2c

a—peak 1   b—peak 2   c—peak 3   d—peak 4

图  5   当L₁=70 nm, L₂=40 nm, a=0 nm时，不同费米能级所对应的反射谱和吸收谱

Figure  5.   Reflection spectra and absorption spectra with different Fermi levels E_F (L₁=70 nm, L₂=40 nm, a=0 nm)

图  6   当L₁=70 nm, a=0 nm, E_F=0.5 eV时，纳米片Ⅱ不同长度时所对应的反射谱

Figure  6.   Reflection spectra with different length of nanosheet Ⅱ (L₁=70 nm, a=0 nm, E_F=0.5 eV)

图  7   当L₁=70 nm, L₂=40 nm, E_F=0.5 eV时，错位参量a不同时对应的反射谱

Figure  7.   Reflection spectra with different location parameters a of the nanosheet heterodimer (L₁=70 nm, L₂=40 nm, E_F=0.5 eV)