共查询到20条相似文献,搜索用时 9 毫秒
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亚波长金属光栅异常透射特性在光电子器件设计中有着极其重要的应用。不同的色散材料模型对金属材料的纳光子器件特性的影响是不同的。在可见光波段,应用FDTD数值模拟方法,分析了PEC(perfect conductor)、Drude和Lorentz-Dmde金属材料模型对亚波长金属光栅透射率的影响。在FUID算法中,引入Auxiliary Differentia Equation(ADE)方法解决了频域Dmde、Lonentz-Drudc模型到时域的转化。研究结果表明,应用ADE-FDTD方法,在可见光波段选用Lorenz-Dnale模型能更精确的模拟金属光栅的透射率。 相似文献
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金属线栅结构中太赫兹波偏振特性的研究 总被引:4,自引:0,他引:4
利用飞秒微加工和磁控溅射技术,在熔融石英衬底上设计并制作了不同结构的金属线栅,通过太赫兹时域光谱系统研究了线栅结构对太赫兹波偏振透射特性的影响,并用有限时域差分法对实验结果进行了模拟验证.分析了影响S和P两个偏振方向太赫兹波透射的物理机制.为制作太赫兹波段偏振器件提供了有益的参考. 相似文献
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通过时域有限差分法模拟金属光栅狭缝中的光场分布随时间的演化及狭缝阵列参数对透射光谱的影响.进一步证明.一维金属光栅的透射光增强效应起源于狭缝中光场的类Fabry-Perot(F-P)共振。光栅参数变化产生的透射光谱的漂移是由于其对这种类F--P腔长度的调制。 相似文献
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提出了一种基于BLT(Baum-Liu-Tesche)方程的平面波辐照下金属腔贯通导线电磁干扰分析的快速计算方法.首先采用电磁拓扑理论将整个问题进行拓扑分解,根据场线耦合理论获得场线耦合节点的传输函数,进而采用广义BLT方程获得外界电磁波与贯通导线相互作用时金属腔内终端负载上的干扰电流.将该算法用于贯通单导线、贯通双导线和贯通传输线网络电磁干扰问题分析,计算获得的终端负载上感应电流结果与全波分析方法结果吻合较好,证明了该快速算法的有效性.该快速算法计算时间仅为全波分析法的万分之一,且所占内存相比全波分析法缩小了几十倍. 相似文献
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TE wave properties of slab dielectric waveguides with nonlinear non-Kerr-like substrate and cladding are presented. The guide can support even- and odd-symmetric modes in asymmetrical substrate and asymmetrical modes in completely symmetrical substrate. Dispersion relations and electric field profiles are illustrated and analytically discussed in detail 相似文献
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多层双各向同性媒质中电磁波的传输特性 总被引:2,自引:2,他引:0
用不对称传输线模型分析了平面电磁波垂直入射于多层双各向同性媒质的反射和透射问题,导出了形式上较简单的计算多层双各向同性媒质界面反射和透射系数公式。为了便于和已有的文献结果相比较,给出计算实例,结果表明,用此公式得出的结果和文献结果一致,为计算多层双各向同性媒质的反射和透射带来方便;同时,对双各向同性媒质,非互易参数和手征参数的改变对反射和透射系数都有较大的影响。 相似文献
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Volakis J.L. Lin Y.C. Anastassiu H. 《Antennas and Propagation, IEEE Transactions on》1994,42(2):205-212
Closed-form expressions are derived for the TE scattering by a narrow resistive strip array in the presence of a dielectric slab. This is accomplished by introducing a single edge-mode expansion to represent the strip current density followed by a Galerkin's solution of the pertinent integral equation. The accuracy of the derived approximate expressions are examined by comparison with a moment method solution and several curves are shown, illustrating how the different array parameters affect the reflectivity and transmissivity of the array. Particular attention is given to the free-standing resistive strip array where an equivalent uniform resistive sheet is constructed for simulating the original periodic structure. The reactance of this equivalent sheet is compared with published expressions pertinent to the metallic strip array 相似文献
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A parameter study of electromagnetic wave propagating through the air-chiro ferrite inter face and through a chiro ferrite slab is presented, and such bianisotropic medium can be made from chiral and gyrotropic ferrite materials artifically. The partial differential equations of the fourth order defining the field components Ey and Hy in chiroferrite are derived. The influence of different constitutive parameters on the transmission coefficients and refraction angles of transmitted fields are demonstrated. The results show that chirality causes strong effect of energy conversion between mode 1 and 2. 相似文献
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非均匀势场中物质波的反射和透射 总被引:1,自引:1,他引:0
利用与时间无关的薛定谔方程和亥姆霍兹方程的形式相似性,把势场分布和能量本征值分别与光波导中的折射率分布和传播常数相对应,将分析光波导的分析转移矩阵用于分析微观粒子贯穿势垒的量子隧道效应。最终在不求解薛定谔方程且不引入任何近似的情况下得到了微观粒子穿越任意势垒的反射系数和反射几率的精确解析式。分析表明所得公式精确,物理意义非常清楚,通用性强。在研究量子隧道效应、量子反射、量子粒子和隧道共振等方面具有一定的应用价值。 相似文献
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为拓宽活性材料对太阳光谱的吸收范围,实现器 件的宽谱吸收增强,本文提出一种基 于光栅结构的新型有机太阳能电池器件,该器件在一个周期内引入不同占空比的光栅来构成 级联光栅。本文采用时域有限差分法从理论上研究了级联光栅结构对器件吸收性能的影响, 结果表明该结构可激发多个表面等离激元谐振,这些不同波长下的谐振模式可以在吸收光谱 中同时存在,从而实现宽谱吸收增强。考虑太阳光谱的影响,在TM和TM/TE混合偏振模式 下,活性材料的整体吸收效率从等效平板结构的23.9%分别提高到54.2%和36.4%,分别增 强126.8%和52.3%,且基于该级联光栅结构的 太阳能电池器件可实现在0到65度入射角范 围内的广角吸收。此外,在TM偏振模式下,该器件的吸收性能对光栅参数微小误差变化的 敏感性较低,适用于实际纳米器件 的制备。这项工作的理论结果有助于纳米金属光栅在有机 太阳能电池中的应用提供新的理论指导。 相似文献
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V. G. Shavrov V. I. Shcheglov 《Journal of Communications Technology and Electronics》2016,61(3):234-242
The possibility of solution of the problem of wave propagation through an interface of two dissipative media with the help of a trigonometric vector model is shown. Two invariants independent of the dissipation of these media are revealed: (i) the sum of projections of vectors of reflected and transmitted waves onto the polar axis, which is equal to the projection of the vector of the incident wave onto the same axis, and (ii) the sum of projections of vectors of these waves onto the normal to the polar axis, which is equal to zero. 相似文献
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R. G. Tarkhanian 《Journal of Infrared, Millimeter and Terahertz Waves》1994,15(4):739-750
Dispersion relations of coupled magnon-plasmon surface electromagnetic waves propagating along the interface between antiferrodielectric and uniaxial semiconductor are considered. Total transmission of infrared wave trough such layered structure induced by resonant excitation of the surface wave is investigated. 相似文献
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I. V. Antonets L. N. Kotov V. G. Shavrov V. I. Shcheglov 《Journal of Communications Technology and Electronics》2009,54(10):1111-1123
With the use of the 1D wave equation as an example, the wave incidence on one interface and on two interfaces of media with
arbitrary complex parameters is analyzed. It is noted that, when the energy reflection, transmission, and absorption coefficients
are calculated by means of traditional techniques, their sum exceeds unity if the wave number in the first medium is complex.
The complex character of the energy balance on the media interfaces is revealed. Definitions are introduced and the properties
of complex reflection, transmission, localization, reactivity, and absorption are considered. 相似文献
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基于耦合模理论,采用传输矩阵法分析了相移对级联长周期光纤光栅传输特性的影响。研究表明,当级联光栅间相移量从0至π变化时,传输谱主阻带左边会出现一个小的阻带,且相移量越大,小阻带的幅值越大。当相移量增大到π时,小阻带幅值增大到与原阻带相当;当相移量从π增至2π时,传输谱主阻带右边会出现一个小的阻带,且相移量越大,小阻带的幅值越小。随相移量的增大,主阻带最大损耗峰对应的谐振波长向长波长方向偏移。调节相移量可灵活地改变主阻带最大损耗峰对应的谐振波长,为新型光纤光栅器件的开发提供新的视角和理论依据。 相似文献
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