Negative-permittivity plasma generation in negative-permeability space with high-energy metamaterial
Negative-permittivity plasma generation in negative-permeability space with high-energy metamaterial
复制标题
高能超材料在负磁导率空间产生负介电常数等离子体
DOI：
10.1088/0963-0252/25/5/055019
复制
发表时间：
2016
影响因子：
3.8
通讯作者：
A. Iwai and S. Iio
中科院分区：
文献类型：
--
作者：
O. Sakai;Y. Nakamura;A. Iwai and S. Iio
利用实验结果和理论模型对电磁波在负磁导率空间中产生等离子体进行了分析。安装负磁导率的超材料会引发电磁波传播的剧烈变化。与通常的磁导率为+1的情况不同，负磁导率会在没有等离子体的空间中诱导出消逝模式。然而，如果高电子密度或过高密度的等离子体使介电常数变为负值，电磁波就会传播，因为会出现负折射率状态。在这项研究中，我们回顾了我们以前的实验数据，从波的传播和波介质的参数两个方面研究了等离子体产生的基本物理过程。我们确认了密度演化阶段的非线性(跃迁)过程，直至准稳态阶段的负介电常数态和负折射率态。我们还注意到，与传统的由固态材料组成的超材料不同，当我们使用等离子体时，这种含能超材料是建立起来的。
Plasma generation by electromagnetic waves in negative-permeability space is analyzed using experimental results and theoretical models. Installation of negative-permeability metamaterials triggers drastic changes to the propagation of electromagnetic waves. Unlike usual cases in which permeability is+ 1, negative permeability induces evanescent modes in a space without plasma. However, if permittivity becomes negative due to high-electron-density or overdense plasma, electromagnetic waves can propagate because negative-refractive-index states emerge. In this study, reviewing our previous experimental data, we study the underlying physical processes in plasma generation in terms of wave propagation and parameters of wave media. We confirm nonlinear (transition) processes in the phase of density evolution up to the negative permittivity state and negative-refractive-index states in the quasi-steady phase. We also note that such energetic metamaterials are built up when we use plasma, unlike conventional metamaterials composed of solid-state materials.