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设计了一种涂覆石墨烯的非对称椭圆电介质纳米并行线波导. 在椭圆柱坐标系中, 借助于Mathieu函数和坐标变换, 采用多极方法对波导所支持的6个最低阶模式进行了研究, 并分析了这些模式的特性与工作波长、石墨烯费米能以及波导结构参数之间的依赖关系. 结果表明, 调节波导的工作波长、石墨烯的费米能及纳米线之间的间距, 可大幅度调节这些模式的特性. 调节纳米线的半长轴及半短轴, 可以微调这些模式的特性. 在两种条件下, 通过比较涂覆石墨烯的单根椭圆电介质纳米线、对称椭圆电介质纳米并行线与非对称椭圆电介质纳米并行线所支持的基模的性能, 发现本文所设计的波导的性能优于其他两种波导. 本文的研究工作可以为涂覆石墨烯的非对称椭圆电介质纳米并行线波导的设计、制作及应用提供理论基础.An asymmetric graphene-coated elliptical dielectric nano-parallel wires’ waveguide is proposed. By using the multipole method, in the two elliptic cylindrical coordinate systems, firstly, the longitudinal component of the electric field and the magnetic field are expressed by Mathieu functions, then the corresponding angular and radial components are obtained by Maxwell’s equations. The graphene is regarded as a zero-thickness interface with surface conductivity, and the boundary conditions are applied to these interfaces by the point-matching method. A linear algebraic equation system is obtained finally. The effective refractive indices and the field distributions of modes can be obtained by numerically solving the equation. The six lowest order modes supported by the proposed structure are classified, and the dependence of the characteristics of these modes, separately, on the working wavelength, the graphene Fermi energy and waveguide structure parameters are studied. The real part of the effective refractive index, the propagating length, and the quality factor are used to judge the performance of the waveguide. The results reveal that the characteristics of these modes can be greatly changed by altering the working wavelength of the waveguide, the Fermi energy of graphene, and the spacing between nanowires. When the length of the semi-major and the semi-minor axes of the nanowires are modified, the real part of the effective refractive index, the propagating length, and the quality factor can only be changed finely. At the same time, the results obtained by the multipole method are completely consistent with the results from the finite element method. By comparing the performances among the fundamental mode supported by the single graphene-coated elliptical dielectric nanowire, the symmetric graphene-coated elliptical dielectric nano-parallel wires, and the asymmetric graphene-coated elliptical dielectric nano-parallel wires by the means of the FEM based on commercial software (COMSOL), we find that the performances of the proposed waveguide in this paper are superior to those of the other two waveguides. This work can provide a theoretical basis for the design, fabrication, and application of asymmetric graphene-coated elliptical dielectric nano-parallel wires’ waveguide. The proposed structure is expected to be used in the mode conversion and coupling in the future devices.
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Keywords:
- graphene /
- nanowires /
- waveguides /
- multipole method
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图 2 在
${E_{\rm{f}}} = 0.5\;{\rm{eV}}$ ,$\lambda = 7\;\text{μm}$ ,${a_1} = 90\;{\rm{nm}}$ ,${b_1} = 70\;{\rm{nm}}$ ,${a_2} = 80\;{\rm{nm}}$ ,${b_2} = 60\;{\rm{nm}}$ ,$d = 40\;{\rm{nm}}$ 条件下, 6个最低阶模式的模式合成图 (a)−(f)、电场的z分量分布图(g)−(l)和电场强度分布图(m)−(r)Fig. 2.
${E_{\rm{f}}} = 0.5\;{\rm{eV}}$ ,$\lambda = 7\;\text{μm}$ ,${a_1} = 90\;{\rm{nm}}$ ,${b_1} = 70\;{\rm{nm}}$ ,${a_2} = 80\;{\rm{nm}}$ ,${b_2} = 60\;{\rm{nm}}$ and$d = 40\;{\rm{nm}}$ , pattern composition diagram (a)−(f), the z-component of electric field${E_z}$ (g)−(l) and the electric field distribution$\left| E \right|$ for the six lowest order modes (m)−(r).图 3 当
${E_{\rm{f}}} = 0.5\;{\rm{eV}}$ ,${a_1} = 90\;{\rm{nm}}$ ,${b_1} = 70\;{\rm{nm}}$ ,${a_2} = 80\;{\rm{nm}}$ ,${b_2} = 60\;{\rm{nm}}$ ,$d = 20\;{\rm{nm}}$ 时, (a)有效折射率${\rm{Re}} ({n_{{\rm{eff}}}})$ 、(b)传播长度$L_{\rm{prop}}$ 、(c)品质因数FOM随工作波长$\lambda $ 变化关系图; (d)$\lambda = 6.2\; \text{μm}$ , (e)$\lambda = 7\;\text{μm}$ , (f)$\lambda = 7.8\; \text{μm}$ 时基模的电场强度变化图Fig. 3. The dependence of (a) the effective refractive index
${\rm{Re}} ({n_{{\rm{eff}}}})$ , (b) the propagation length$L_{\rm{prop}}$ , (c) the quality factor FOM for the six lowest order modes on the wavelength$\lambda $ at${E_{\rm{f}}} = 0.5\;{\rm{eV}}$ ,${a_1} = 90\;{\rm{nm}}$ ,${b_1} = 70\;{\rm{nm}}$ ,${a_2} = 80\;{\rm{nm}}$ ,${b_2} = 60\;{\rm{nm}}$ ,$d = 20\;{\rm{nm}}$ . And the electric field distribution$\left| E \right|$ for (d)$\lambda = 6.2\; \text{μm}$ , (e)$\lambda = 7\;\text{μm}$ , (f)$\lambda = 7.8\; \text{μm}$ .图 4 当
$\lambda = 7\;{\text{μ}\rm{m}}$ ,${a_1} = 90\;{\rm{nm}}$ ,${b_1} = 70\;{\rm{nm}}$ ,${a_2} = 80\;{\rm{nm}}$ ,${b_2} = 60\;{\rm{nm}}$ ,$d = 20\;{\rm{nm}}$ 时 (a)有效折射率${\rm{Re}} ({n_{{\rm{eff}}}})$ 、(b)传播长度${L_{{\rm{prop}}}}$ 和(c)品质因数FOM随石墨烯费米能${E_{\rm{f}}}$ 变化关系图Fig. 4. The dependence of (a) the effective refractive index
${\rm{Re}} ({n_{_{{\rm{eff}}}}})$ , (b) the propagation length${L_{{\rm{prop}}}}$ and (c) the quality factor FOM for the six lowest order modes on the graphene Fermi levels${E_{\rm{f}}}$ at$\lambda = 7\;{\text{μ}\rm{m}}$ ,${a_1} = 90\;{\rm{nm}}$ ,${b_1} = 70\;{\rm{nm}}$ ,${a_2} = 80\;{\rm{nm}}$ ,${b_2} = 60\;{\rm{nm}}$ ,$d = 20\;{\rm{nm}}$ .图 5 当
$\lambda = 7\;\text{μm}$ ,${E_{\rm{f}}} = 0.5\;{\rm{eV}}$ ,${a_1} = 90\;{\rm{nm}}$ ,${b_1} = 70\;{\rm{nm}}$ ,${a_2} = 80\;{\rm{nm}}$ ,${b_2} = 60\;{\rm{nm}}$ (a)有效折射率${\rm{Re}} ({n_{{\rm{eff}}}})$ , (b)传播长度${L_{{\rm{prop}}}}$ , (c)品质因数FOM随两纳米线间距d变化关系图; (d)$d = 15\;{\rm{nm}}$ , (e)$d = 35 \;{\rm{nm}}$ , (f)$d = 55 \;{\rm{nm}}$ 时基模的电场强度变化图Fig. 5. The dependence of (a) the effective refractive index
${\rm{Re}} ({n_{{\rm{eff}}}})$ , (b) the propagation length${L_{{\rm{prop}}}}$ , (c) the quality factor FOM for the six lowest order modes on the distance d between two nanowires at$\lambda = 7\;\text{μm}$ ,${E_{\rm{f}}} = 0.5\;{\rm{eV}}$ ,${a_1} = 90\;{\rm{nm}}$ ,${b_1} = 70\;{\rm{nm}}$ ,${a_2} = 80\;{\rm{nm}}$ ,${b_2} = 60\;{\rm{nm}}$ ; the electric field distribution$\left| E \right|$ for (d)$d = 15\;{\rm{nm}}$ , (e)$d = 35 \;{\rm{nm}}$ , (f)$d = 55 \;{\rm{nm}}$ .图 6 当
$\lambda = 7\;\text{μm}$ ,${E_{\rm{f}}} = 0.5\;{\rm{eV}}$ ,${b_1} = 70\;{\rm{nm}}$ ,${a_2} = 80\;{\rm{nm}}$ ,${b_2} = 60\;{\rm{nm}}$ ,$d = 30\;{\rm{nm}}$ 时, (a)有效折射率实部${\rm{Re}} ({n_{{\rm{eff}}}})$ 、(b)传播长度${L_{{\rm{prop}}}}$ 和(c)品质因数FOM随1号纳米线半长轴${a_1}$ 变化关系图Fig. 6. When
$\lambda = 7\;\text{μm}$ ,${E_{\rm{f}}} = 0.5\;{\rm{eV}}$ ,${b_1} = 70\;{\rm{nm}}$ ,${a_2} = 80\;{\rm{nm}}$ ,${b_2} = 60\;{\rm{nm}}$ ,$d = 30\;{\rm{nm}}$ , the dependence of (a) the effective refractive index${\rm{Re}} ({n_{{\rm{eff}}}})$ , (b) the propagation length${L_{{\rm{prop}}}}$ , and (c) the quality factor FOM for the six lowest order modes on the length of${a_1}$ on the No.1 nanowire.图 7 当
$\lambda = 7\;\text{μm}$ ,${E_{\rm{f}}} = 0.5\;{\rm{eV}}$ ,${a_1} = 90\;{\rm{nm}}$ ,${a_2} = 80\;{\rm{nm}}$ ,${b_2} = 60\;{\rm{nm}}$ ,$d = 35\;{\rm{nm}}$ 时, (a)有效折射率实部${\rm{Re}} ({n_{{\rm{eff}}}})$ 、(b)传播长度${L_{{\rm{prop}}}}$ 和(c)品质因数FOM随1号纳米线半短轴b1变化关系图Fig. 7. When
$\lambda = 7\;\text{μm}$ ,${E_{\rm{f}}} = 0.5\;{\rm{eV}}$ ,${a_1} = 90\;{\rm{nm}}$ ,${a_2} = 80\;{\rm{nm}}$ ,${b_2} = 60\;{\rm{nm}}$ ,$d = 35\;{\rm{nm}}$ , the dependence of (a) the effective refractive index${\rm{Re}} ({n_{{\rm{eff}}}})$ , (b) the propagation length${L_{{\rm{prop}}}}$ and (c) the quality factor FOM for the six lowest order modes on the length of${b_1}$ on the No.1 nanowire.图 8 当
${E_{\rm{f}}} = 0.5\;{\rm{eV}}$ 时, 三种波导结构所支持的基模的 (a)有效折射率${\rm{Re}} ({n_{{\rm{eff}}}})$ 、(b)传播长度和${L_{{\rm{prop}}}}$ 和(c)品质因数FOM随波长$\lambda $ 变化的关系图Fig. 8. When
${E_{\rm{f}}} = 0.5\;{\rm{eV}}$ , the dependence of (a) the effective refractive index${\rm{Re}} ({n_{{\rm{eff}}}})$ , (b) the propagation length${L_{{\rm{prop}}}}$ and (c) the quality factor FOM of the fundamental mode supported by the three structures on the wavelength$\lambda $ .图 9 当
$\lambda = 7\;{\rm{\mu m}}$ 时, 三种波导结构所支持的基模的 (a)有效折射率${\rm{Re}} ({n_{{\rm{eff}}}})$ 、(b)传播长度${L_{{\rm{prop}}}}$ 和(c)品质因数FOM随石墨烯的费米能级变化的关系图Fig. 9. When
$\lambda = 7\;{\rm{\mu m}}$ , the dependence of (a) the effective refractive index${\rm{Re}} ({n_{{\rm{eff}}}})$ , (b) the propagation length${L_{{\rm{prop}}}}$ and (c) the quality factor FOM of the fundamental mode supported by the three structures on the Fermi levels. -
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Google Scholar
[2] Vakil A, Engheta N 2011 Science 332 1291
Google Scholar
[3] Parvaei B, Saghai H R, Eldlio M 2018 Opt. Quantum Electron. 50 303
Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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