多尺度结构表面欺骗-绝缘体-欺骗波导的微波带隙和腔模
Microwave band gap and cavity mode in spoof-insulator-spoof waveguide with multiscale structured surface
摘要：
我们提出了一种多尺度欺骗绝缘体欺骗（SIS）波导，通过引入周期性的几何调制的波长尺度的SIS波导制成的完美的电导体。MSIS由多个SIS子单元组成。在小间隙近似下，解析地研究了欺骗表面等离子体激元（SSPP）基导模的色散关系。结果表明，由于布拉格散射，多尺度SIS具有微波带隙（MBG）。提供了设计参数空间中的“间隙图”。我们证明了子单元的几何形状可以有效地调节单元SIS的有效折射率，从而进一步控制MBG的宽度和位置。计算结果与有限元数值计算结果吻合较好。对于给定几何尺寸的有限尺寸MSIS，在毫米尺度下，有限元计算表明，一阶对称SSPP模式在MBG中在4.29 GHz至5.1 GHz的频率范围内具有零传输。在4.58 GHz处的间隙内观察到腔模，其来自多尺度SIS波导中的设计者“点缺陷”。此外，EMPMSIS波导示出具有对称和反对称模式与自己的MBG，分别。这种结构的深亚波长限制和对SSPP传播的极大控制，使其在小型化微波器件中具有潜在的应用前景。
英文摘要：
We propose a multiscale spoof-insulator-spoof (SIS) waveguide by introducing periodic geometry modulation in the wavelength scale to a SIS waveguide made of perfect electric conductor. The MSIS consists of multiple SIS subcells. The dispersion relationship of the fundamental guided mode of the spoof surface plasmon polaritons (SSPPs) is studied analytically within the small gap approximation. It is shown that the multiscale SIS possesses microwave band gap (MBG) due to the Bragg scattering. The "gap maps" in the design parameter space are provided. We demonstrate that the geometry of the subcells can efficiently adjust the effective refraction index of the elementary SIS and therefore further control the width and the position of the MBG. The results are in good agreement with numerical calculations by the finite element method (FEM). For finite-sized MSIS of given geometry in the millimeter scale, FEM calculations show that the first-order symmetric SSPP mode has zero transmission in the MBG within frequency range from 4.29 GHz to 5.1 GHz. A cavity mode is observed inside the gap at 4.58 GHz, which comes from a designer "point defect" in the multiscale SIS waveguide. Furthermore, ultrathin MSIS waveguides are shown to have both symmetric and antisymmetric modes with their own MBGs, respectively. The deep-subwavelength confinement and the great degree to control the propagation of SSPPs in such structures promise potential applications in miniaturized microwave device.
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