Overdense Microwave Plasma Generation in a Negative-Permeability Space
Overdense Microwave Plasma Generation in a Negative-Permeability Space
复制标题
负磁导率空间中的过密微波等离子体生成
DOI：
10.1585/pfr.8.1406167
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发表时间：
2013
影响因子：
0.8
通讯作者：
Yoshihiro Nakamura
中科院分区：
文献类型：
--
作者：
O. Sakai;S. Iio;Yoshihiro Nakamura
对高功率电磁波在负磁导率空间中的传播进行了理论和实验研究，并成功地产生了过密等离子体。理论分析表明，在适当的电场作用下，高密度等离子体可以通过鞍结分岔形成负介电常数的等离子体。为了证实理论预测，使用具有磁共振实现的负磁导率的超材料，我们将数百瓦的微波注入充满低压放电气体的波导中。朗缪尔探针测量表明，所产生的等离子体是远远超过截止密度为2.45 GHz的波频率，并表示正介电常数（低电子密度）和负介电常数（过密）状态之间的过渡。
High-power electromagnetic waves propagating in a negative-permeability space were investigated theoretically and experimentally, and they generated overdense plasmas successfully. Theoretical analysis predicted that high-density plasmas with negative permittivity can form via saddle-node bifurcations within an adequate electric field. To confirm theoretical predictions, using metamaterials with negative permeability achieved by magnetic resonances, we injected microwaves with several hundreds of watt into a waveguide filled with a low-pressure discharge gas. Langmuir probe measurement revealed that a generated plasma is well beyond the cutoff density for the wave frequency of 2.45 GHz, and indicated transition between positive-permittivity (low-electron-density) and negative-permittivity (overdense) states.