耦合波导中俘获电磁模的特性
Properties of trapped electromagnetic modes in coupled waveguides
摘要：
实验研究了耦合电磁波导中不同对称度的混合模结构中陷波模的存在性。在这样的开放几何中，限制解的出现被证明比迄今为止所证明的要普遍得多，正如Goldstone和Jaffe所预测的那样[J.Goldstone和R. L. Jaffe，Phys.Rev.B45，14100（1992）]。观测模式的识别是基于相对矢量场的数值模拟。实验结果表明，随着结构孔径的增加，模式的限制得到改善，而不会产生额外的泄漏通道。特别是，长寿命的捕获模式可以很容易地获得在几何形状与相关程度的孔径。它们的谐振参数可以与工作在毫米波长的标准闭合腔的谐振参数相竞争。详细讨论了对称性对这些陷波模性质的影响。
英文摘要：
The existence of trapped modes in coupled electromagnetic waveguides is experimentally investigated for configurations with different degrees of symmetry supporting hybrid modes. The occurrence of confined solutions in such open geometries is proven to be much more general than demonstrated so far, as predicted by Goldstone and Jaffe [J. Goldstone and R. L. Jaffe, Phys. Rev. B 45, 14100 (1992)]. The identification of the observed modes is based on the numerical modeling of the relative vector fields. The experimental results evidence as an increasing aperture of the configuration can improve the confinement of the mode instead of generating additional leakage channels. In particular, long-lived trapped modes can be easily obtained in geometries with a relevant degree of aperture. Their resonance parameters can compete with those of standard close cavities working at millimeter wavelengths. The role of the symmetry on the properties of these trapped modes is discussed in detail.
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