A novel dispersive FDTD formulation for modeling transient propagation in chiral metamaterials
A novel dispersive FDTD formulation for modeling transient propagation in chiral metamaterials
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DOI：
10.1109/tap.2004.834153
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发表时间：
2004-09
影响因子：
5.7
通讯作者：
A. Akyurtlu;D. Werner
中科院分区：
文献类型：
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作者：
A. Akyurtlu;D. Werner
用于微波频率应用的手性介质可以被描述为由随机定向螺旋（尺寸通常小于波长）组成的超材料，嵌入以介电常数和磁导率为特征的非手性背景中。手性超材料具有磁电耦合和极化旋转的特性。手性介质也是高度色散的，没有有效的全波时域公式来模拟通过这类重要的超材料的瞬态传播。本文介绍了一种新的时域有限差分（FDTD）技术，该技术基于波场分解技术和分段线性递推卷积方法的实现来模拟电磁波与各向同性色散手性超材料的相互作用。这个公式在FDTD社区中是第一个。通过一维算例验证了时域有限差分模型，并将仿真结果与已有的分析结果进行了比较。此外，时域有限差分技术还用于研究电磁波在包括色散手性介质和双负介质在内的多层超材料板中的传播。因此，该模型能够研究具有磁电耦合和双负行为的复杂色散超材料，并有助于开发其独特的性能，用于各种可能的应用。
Chiral media engineered for applications at microwave frequencies can be described as metamaterials composed of randomly oriented helices (with sizes typically less than a wavelength) embedded within an achiral background that is characterized by its permittivity and permeability. Chiral metamaterials embody properties of magnetoelectric coupling and polarization rotation. Chiral media are also highly dispersive and no effective full-wave time domain formulation has been available to simulate transient propagation through such an important class of metamaterials. A new finite-difference time-domain (FDTD) technique is introduced in this paper to model the interaction of an electromagnetic wave with isotropic dispersive chiral metamaterials, based on the implementation of a wavefield decomposition technique in conjunction with the piecewise-linear recursive convolution method. This formulation represents the first of its kind in the FDTD community. The FDTD model is validated by considering a one-dimensional example and comparing the simulations with available analytical results. Moreover, the FDTD technique is also used to investigate the propagation of electromagnetic waves through multilayered metamaterial slabs that include dispersive chiral and double-negative media. Hence, this model enables the investigation of complex dispersive metamaterials with magnetoelectric coupling and double-negative behavior as well as facilitates the exploitation of their unique properties for a variety of possible applications.