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Time domain models of negative refractive index metamaterials

机译：负折射率超材料的时域模型

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The physics and wave properties of materials with negative refractive index have been studied extensively in recent years. However, computationally efficient numerical models for such media are not readily available to designers who wish to create novel components that incorporate such materials. In addition to being numerically efficient and robust, they must incorporate the dispersive behavior of the refractive index and the wave impedance of metamaterials and allow for the imposition of realistic boundary geometries and properties. In this paper we present a 3D numerical model that is based on the distributed node TLM network in which reactive elements are embedded. The resulting periodic structure supports backward waves and constitutes an artificial medium with negative phase velocity and negative refractive index. When embedded in a time domain electromagnetic field simulator, this model provides a versatile simulation tool for metamaterial design. Since such a transmission line model is realizable it also provides a framework for the actual realization of 3D metamaterials. We derive the theoretical foundations for the model and show some validating simulation results that demonstrate its capabilities and potential.
机译：近年来，已经在广泛研究了负折射率的材料的物理和波形。然而，对于希望创建包含此类材料的新颖组件的设计人员，这种媒体的计算有效数值模型并不容易获得。除了数值有效且坚固之外，它们必须包含折射率的分散行为和超材料的波阻抗，并允许施加现实的边界几何形状和性质。在本文中，我们提出了一种基于分布式节点TLM网络的3D数值模型，其中嵌入了无功元件。所得到的周期结构支持向后波并构成具有负相速度和负折射率的人造介质。当嵌入时域电磁场模拟器时，该模型为超材料设计提供了一种多功能仿真工具。由于这种传输线模型可实现，因此它还提供了用于实际实现3D超材料的框架。我们派生了该模型的理论基础，并显示了一些验证仿真结果，展示了其能力和潜力。

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