法拉第手征圆波导电中混合模的传输特性

本文研究了法拉第手征圆波导中混合模的传输特性，而在这种双各向异性复杂导波结构中，传输模的横向场分量仍可以用纵向场分量来表示，用Ｍｕｅｌｌｅｒ求根法分析了不同阶混合模的色散和衰减特征，以及不同本构参数对混合模传播特性的影响。     

平板状双轴旋电磁手征波导中的耦合模理论

本文严格分析了一种新型双轴旋电磁手征波导中耦合模的传输特性。首先，给出了这种双各向异性手征波导中各横向场分量的纵向场分量表示式，由此得到了纵向场分量的耦合模方程，以及平板状双轴旋电磁手征波导中的色散方程。用数值方法研究了它的色散和截止特性，特别考察了双各向异性和手征性引起的波模分裂，转换效应。     

双各向异性有耗平板状波导中高阶混合横的传输特性

本文首先建立了平板状有耗双各向异性波导的模型，并将其传输模的横向场分量用纵向场分量来表示。用数值方法分析了高阶混合模的模分裂和场分布特性，并且考察了介质的各向异性和损耗程度对混合模的影响。     

双各向异性有耗平板状波导中高阶混合模的传输特性

本文首先建立了干板状有耗双各向异性波导的模型,并将其传输模的横向场分量用纵向场分量来表示。用数值方法分析了高阶混合模的模分裂和场分布特性,并且考察了介质的各向异性和损耗程度对混合模的影响。     

矩形手征波导中混合模的边元有限元分析法和传输特性研究

本文用矢量有限元－－边元法研究了手征波导的导波特性，与点元有限元法相比，用边元法分析手征波导模式有其明显的优越性，即不需特殊处理就可去除伪模，而且数值计算时可以节约计算机内存。本文以矩形手征波导为例，分析了全填充和部分填充手征介质时混合模的色散特性，讨论了手征导纳，波导尺寸等参量对混合模截止频率的影响，验证了边元法的有效性和正确性。     

导行波在非均匀双向异性平板波导中的传播特性

本文应用模式本征展开和模匹配方法，首先给出了非均匀双各向异性平板波导中混合模的场分布和相应和奇偶模分量色散方程。     

法拉第手征圆波导中旋磁性和手征性的复合效应

基于分离变量和Mller求根法,本文详细地分析了均匀和非均匀法拉第手征圆波导中混合模的传输特性;揭示了模分裂、对称和非互易性、后向波和衰减随不同本构参数的变化規律,而这不同于一般旋磁和互易手征波导情形。     

手征光纤中导模的色散特性

从手征介质中的电磁场本构关系出发，利用麦克斯韦方程组，对纤芯和包层都是手征介质构成的阶跃型手征光纤进行了解析求解，导出了模式场解和特征方程。用数值方法研究了纤芯和包层的手征导纳对手征光纤中导模的归一化传播常数、群延迟、波导色散等特性的影响。     

椭圆手征波导的导模特性研究

该文首先对椭圆手征波导进行了解析求解,导出了模式场解及模式特征方程,然后用数值计算的方法研究了手征参数对椭圆手征波导中导模的色散曲线和截止波长的影响,发现在椭圆手征波导中导模的第一个模式会随手征参数的增加而不同。     

部分填充手征负折射率介质的平行板波导

部分填充手征负折射率介质的平行板波导中电磁波传输的导模特性进行了研究,给出了导模的场分布公式,推导出导模的特征方程.数值计算了导模的色散特性曲线、功率曲线和能流分布,探讨了手征负折射率介质层的厚度、手征参数等对导模特性的影响,发现了导模的一些奇异特性,如存在表面波模、功率流动方向与相位传播方向相反的后向波、功率储存、传播常数三值、模式交叉等现象,还发现此波导中存在电磁波传播的禁带.     

Propagation of Electromagnetic Waves in Rectangular Guides Filled with a Semiconductor in the Presence of a Transverse Magnetic Field

The characteristics of electromagnetic waves propagating in a semiconductor filled rectangular waveguide in the presence of a transverse magnetic field are studied. It is shown that only TE mode waves having y-independent field components (y being the direction of the steady magnetic field) and anomalous modes having all six field components can propagate. The propagation constant of waves characterized by a sinusoidal y dependence of fields is derived. Asymptotic expressions for the fields and the propagation constant are then obtained for the limiting case of a small external magnetic field and some recent experimental results are analyzed in this context.     

A rigorous analysis of a shielded microstrip asymmetric stepdiscontinuity

Microstrip asymmetric step discontinuities are analyzed using a mode-matching technique, leading to the frequency-dependent characteristics of the structure. On both sides of the discontinuity the fields are expanded in terms of the normal even and odd hybrid modes of shielded microstrip lines, taking into account not only the propagating modes but also higher-order even and odd modes, which are evanescent-type waves. The propagation constants of the even and odd hybrid modes are computed using a previously developed method. Then a mode-matching technique is applied in order to obtain the reflection and transmission coefficients of the discontinuity. Numerical results are given for several asymmetric step discontinuities     

Mode transformation in bends of H-waveguides

An algorithm is developed for calculation and optimization of mode transformers based on bends of rectangular ridge waveguides. Cutoff wave numbers and components of electromagnetic fields are calculated with the use of the partial-domain method with allowance for the edge singularity of the electromagnetic field. The amplitude coefficients of the modes propagating in a deformed waveguide are calculated with the help of the cross-section method. The geometries and characteristics of H-waveguide transformers are presented.     

Guided electromagnetic waves in gyrotropic chirowaveguides

The propagation characteristics of hybrid modes in the circular cylindrical and coaxial line gyrotropic chirowaveguides are studied using the technique of separation variables. First, the transverse components of electric and magnetic fields are expressed in terms of the longitudinal components of E and H¯. Then, numerical results are presented for the dispersion behavior and cut-off frequencies as well as the field distributions of hybrid EH_0,1 and HE_n,1, with the effects of different electromagnetic parameters of gyrotropic chiral material taken into consideration. It is shown that the process of mode bifurcation also takes place in the gyrotropic chirowaveguides; this is similar to the cases of reciprocal chirowaveguides. But, gyrotropic chirowaveguides are nonreciprocal bianisotropic devices     

导行波在非均匀双各向异性平板波导中的传播特性

本文应用模式本征展开和模匹配方法，首先给出了非均匀双各向异性平板波导中混合模的场分布和相应的奇偶模分量色散方程．借助数值分析技术，揭示了低阶模的反射和透射系数随双各向异性介质的几何和本构参数变化规律     

High Quality Factor Metallodielectric Hybrid Plasmonic–Photonic Crystals

A 2D polystyrene colloidal crystal self‐assembled on a flat gold surface supports multiple photonic and plasmonic propagating resonance modes. For both classes of modes, the quality factors can exceed 100, higher than the quality factor of surface plasmons (SP) at a polymer–gold interface. The spatial energy distribution of those resonance modes are carefully studied by measuring the optical response of the hybrid plasmonic–photonic crystal after coating with dielectric materials under different coating profiles. Computer simulations with results closely matching those of experiments provide a clear picture of the field distribution of each resonance mode. For the SP modes, there is strong confinement of electromagnetic energy near the metal surface, while for optical modes, the field is confined inside the spherical particles, far away from the metal. Coating of dielectric material on the crystal results in a large shift in optical features. A surface sensor based on the hybrid plasmonic–photonic crystal is proposed, and it is shown to have atomic layer sensitivity. An example of ethanol vapor sensing based on physisorption of ethanol onto the sensor surface is demonstrated.     

Propagating eigenmodes for plane waves in a uniaxial bianisotropicmedium and reflection from a planar interface

A time-harmonic electromagnetic plane wave propagating in a uniaxial bianisotropic medium is considered. Forward- and backward-propagating eigenmodes are identified, together with their dispersion equations. The eigenmodes consist of two pairs with different phase velocities, and the two components of each pair correspond to the forward and backward modes. The propagating modes are used to calculate the reflection coefficient matrix at an interface between a vacuum and a uniaxial bianisotropic half-space. Numerical results for such a reflection are presented as a function of the direction of the optical axis     

Propagation of waves in a medium varying transverse to the direction of propagation

For an inhomogeneous dielectric in which the dielectric constant ε depends onxonly, it has been shown that it is possible to consider modes propagating in thezdirection havingH_{x} = 0orE_{x} = 0such that other field components can be expressed in terms of Exand Hx. The usual TE and TM modes are obtained in the special case of noydependence of the fields. Explicit field patterns and the propagation constants have been obtained for a square-law medium.