光学学报, 2019, 39 (1): 0124001, 网络出版: 2019-05-10
涂覆石墨烯的三根电介质纳米线波导的模式特性 
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Mode Characteristics of Waveguides Based on Three Graphene-Coated Dielectric Nanowires
图 & 表
图 1. 涂覆石墨烯的三根轴心非共面电介质纳米线波导的横截面示意图,其中电介质纳米线外侧黑色的圆环为石墨烯
Fig. 1. Cross section of waveguides based on three graphene-coated dielectric nanowires with non-coplanar axis. The black rings on the outside of the dielectric nanowires are graphene
图 2. 当工作频率f=35 THz,纳米线半径ρ0=ρ1=100 nm,ρ2=50 nm,间距a=175 nm,高度b=60 nm,以及费米能EF=0.5 eV时,5种模式的场分布
Fig. 2. Field distributions of five modes at f=35 THz,ρ0=ρ1=100 nm,ρ2=50 nm,a=175 nm,b=60 nm, and EF=0.5 eV
图 3. (a)有效折射率的实部和(b)传播长度随工作频率f的变化关系
Fig. 3. Dependency of (a) real part of the effective refractive index and (b) propagation length on the operating frequency f
图 4. 当ρ0=ρ1=100 nm,ρ2=50 nm,a=175 nm,b=60 nm,EF=0.5 eV,工作频率分别为(a) 31 THz和(b) 39 THz时,模式1的电场分布
Fig. 4. Distributions of electric field of mode 1 when the operating frequency f is (a) 31 THz and (b) 39 THz at ρ0=ρ1=100 nm,ρ2=50 nm,a=175 nm,b=60 nm, and EF=0.5 eV
图 5. (a)有效折射率的实部和(b)传播长度随半径ρ2的变化关系
Fig. 5. Dependency of (a) real part of the effective refractive index and (b) propagation length on the radius ρ2
图 6. 当ρ0=ρ1=100 nm,f=35 THz,a=175 nm,b=60 nm,EF=0.5 eV,纳米线2的半径分别为(a) 25 nm和(b) 55 nm时,模式1的电场分布
Fig. 6. Distributions of electric field of mode 1 when the radius ρ2 of the nanowire 2 is (a) 25 nm and (b) 55 nm at ρ0=ρ1=100 nm,f=35 THz,a=175 nm,b=60 nm, and EF=0.5 eV
图 7. (a)有效折射率的实部和(b)传播长度随高度b的变化关系
Fig. 7. Dependency of (a) real part of effective refractive index and (b) propagation length on height b
图 8. 当ρ0=ρ1=100 nm,ρ2=50 nm,f=35 THz,a=175 nm,EF=0.5 eV,高度分别为(a) 10 nm和(b) 100 nm时,模式1的电场分布
Fig. 8. Distributions of electric field of mode 1 when the height b is (a) 10 nm and (b) 100 nm at ρ0=ρ1=100 nm,ρ2=50 nm,f=35 THz,a=175 nm, and EF=0.5 eV
图 9. (a)有效折射率的实部和(b)传播长度随间距a的变化关系
Fig. 9. Dependency of (a) real part of effective refractive index and (b) propagation length on space a
图 10. 当ρ0=ρ1=100 nm,ρ2=50 nm,f=35 THz,b=60 nm,EF=0.5 eV,间距分别为(a) 160 nm和(b) 195 nm时,模式1的电场分布
Fig. 10. Distributions of electric field of mode 1 when the space a is (a) 160 nm and (b) 195 nm at ρ0=ρ1=100 nm,ρ2=50 nm,f=35 THz,b=60 nm, and EF=0.5 eV
图 11. (a)有效折射率的实部和(b)传播长度随费米能EF的变化关系
Fig. 11. Dependency of (a) real part of effective refractive index and (b) propagation length on Fermi energy EF
图 12. 当ρ0=ρ1=100 nm,ρ2=50 nm,f=35 THz,a=175 nm,b=60 nm,费米能分别为(a) 0.4 eV和(b) 0.8 eV时,模式1的电场分布
Fig. 12. Distributions of electric field of mode 1 when the Fermi energy EF is (a) 0.4 eV and (b) 0.8 eV at ρ0=ρ1=100 nm,ρ2=50 nm,f=35 THz,a=175 nm, and b=60 nm
图 13. 轴心共面波导与轴心非共面波导的模式1的传播长度比较。(a)频率;(b)中间纳米线的半径;(c)水平方向上两根纳米线的距离;(d)费米能
Fig. 13. Comparison of propagation length of mode 1 of the waveguide with coplanar axis and the waveguide with non-coplanar axis. (a) Frequency; (b) radius of the middle nanowire; (c) distance between two nanowires in the horizontal direction; (d) Fermi energy
卫壮志, 薛文瑞, 彭艳玲, 程鑫, 李昌勇. 涂覆石墨烯的三根电介质纳米线波导的模式特性[J]. 光学学报, 2019, 39(1): 0124001. Zhuangzhi Wei, Wenrui Xue, Yanling Peng, Xin Cheng, Changyong Li. Mode Characteristics of Waveguides Based on Three Graphene-Coated Dielectric Nanowires[J]. Acta Optica Sinica, 2019, 39(1): 0124001.
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