用于可调谐人工电介质和等离子体的分裂同轴电缆介质（SCCM）

中文摘要 AI 辅助

我们提出了分裂同轴电缆介质（Split Coaxial Cable Medium, SCCM），这是一种机械可调谐、电容加载的导线介质，支持具有高面内各向同性的人工电介质和人工等离子体布洛赫模式。其单元胞由被轴向间隙中断的同轴导体构成，相对轴向位移可连续改变它们的电容重叠量和串联电容，同时保持横向晶格几何结构，且使单元胞电感近似不变。我们直接从几何结构推导等效RLC参数，并将其纳入互补分析模型：空间色散局域场模型预测布洛赫色散和等频率轮廓，多层均质化模型提供模式阻抗、低频布洛赫折射率和等离子体频率的闭式估计，以及含损耗的有限平板散射。全波本征模和有限平板模拟验证了这些预测。在研究的位移范围内，模拟得到低频布洛赫折射率的调谐范围达46%，从n₀,min=1.42到n₀,max=2.28；等离子体频率的调谐范围达21%，从fₚ,min=9.45 GHz到fₚ,max=11.61 GHz，同时在两种模式下均确认了Γ点附近的高面内各向同性。这些特性使SCCM有望用于梯度折射率器件、定向天线和可调谐等离子体 haloscope。

英文摘要

We introduce the Split Coaxial Cable Medium (SCCM), a mechanically tunable, capacitively loaded wire medium supporting artificial-dielectric and artificial-plasma Bloch regimes with high in-plane isotropy. Its unit cell comprises coaxial conductors interrupted by axial gaps. Relative axial displacement continuously varies their capacitive overlap and series capacitance while preserving the transverse lattice geometry and leaving the unit-cell inductance approximately unchanged. Equivalent RLC parameters are derived directly from the geometry and incorporated into complementary analytical models. A spatially dispersive local-field model predicts the Bloch dispersion and isofrequency contours, whereas a multilayer homogenization model provides the modal impedance, closed-form estimates of the low-frequency Bloch refractive index and plasma frequency, and loss-inclusive finite-slab scattering. Full-wave eigenmode and finite-slab simulations validate the predictions. Over the investigated displacement range, simulations yield tunabilities of $46\%$ in the low-frequency Bloch refractive index, from $n_{0,\min}=1.42$ to $n_{0,\max}=2.28$, and $21\%$ in the plasma frequency, from $f_{\mathrm{p},\min}=9.45~\mathrm{GHz}$ to $f_{\mathrm{p},\max}=11.61~\mathrm{GHz}$, while confirming high in-plane isotropy near the $Γ$ point in both regimes. These characteristics make the SCCM promising for gradient-index devices, directive antennas, and tunable plasma haloscopes.

发表机构

• School of Physics and Engineering, ITMO University（ITMO大学物理与工程学院）
• School of Engineering, New Uzbekistan University（新乌兹别克斯坦大学工程学院）
• Department of Physics, Universidad Nacional de Colombia（哥伦比亚国立大学物理系）

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