Localized breaking of parameter uniformity by macroscopically-negative-permeability metamaterial in low-pressure microwave plasma
Localized breaking of parameter uniformity by macroscopically-negative-permeability metamaterial in low-pressure microwave plasma
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低压微波等离子体中宏观负磁导率超材料局部破坏参数均匀性
DOI：
10.1088/1361-6595/ab2d74
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发表时间：
2020
影响因子：
3.8
通讯作者：
O. Sakai and Y. Omura
中科院分区：
文献类型：
--
作者：
A. Iwai;Y. Nakamura;O. Sakai and Y. Omura
等离子体参数和传输的微波的测量是在一个复合材料的双开口环谐振器（DSRR），使磁导率负和等离子体激发的2.45 GHz的微波。我们以100-200 W的功率发射微波，通过低频和低占空比的脉冲波调制来检测等离子体参数的时间演化。我们在不同的位置与不同的距离从DSRR的支撑板进行测量，并发现增强的波传输的电子温度的非均匀分布的复合材料。为了加强测量的电子温度，我们评估的电子能量分布函数（EEDF）通过推导出的电子电流的第二偏差，数据平滑的方法应用后，估计的EEDF变得空间上不均匀的电子温度具有类似的轮廓。在增强波传输的结果的有效性方面，一维电磁粒子模拟揭示了复合材料内部的偷偷微波。与负磁导率和被动（正磁导率）DSRR的情况下相比，我们确认的非均匀性是由于磁共振的DSRR，这是一个微观的影响DSRR等离子体产生，而他们的宏观效应，使磁导率为负，增强波能量传输内的复合材料。
Measurements of plasma parameters and transmitted microwaves are performed in a composite of double-split-ring resonators (DSRRs) making magnetic permeability negative and plasmas excited by a 2.45 GHz microwave. We launch the microwave at 100–200 W, modulated by a pulse wave at a low frequency and a low duty ratio to detect time evolutions of plasma parameters. We perform the measurements at different positions with varying distance from the supporting plate of the DSRRs, and find enhanced wave transmission in the composite with non-uniform profiles of electron temperature. To reinforce the measurements of electron temperature, we evaluate the electron energy distribution function (EEDF) by deriving the second deviation of electron current, upon which data smoothing methods are applied, and the estimated EEDF becomes spatially non-uniform with a similar profile to electron temperature. In terms of the validity of results on the enhanced wave transmission, one-dimensional electromagnetic particle simulations reveal sneaking microwaves inside the composite. In comparison with cases of the negative-permeability and the passive (positive-permeability) DSRRs, we confirm that the non-uniformity is attributed to the magnetic resonance of the DSRRs, which is a microscopic effect of the DSRRs to plasma generation, whereas their macroscopic effect makes permeability negative and enhances wave energy transfer inside the composite.
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负磁导率空间中的过密微波等离子体生成
影响因子：
0.8
作者：
O. Sakai;S. Iio;Yoshihiro Nakamura
通讯作者：
Yoshihiro Nakamura
影响因子：
2.3
作者：
A. Iwai;Yoshihiro Nakamura;A. Bambina;O. Sakai
通讯作者：
A. Iwai;Yoshihiro Nakamura;A. Bambina;O. Sakai
场相关超材料中正介电常数和负介电常数之间的转变
影响因子：
3.2
作者：
O. Sakai
通讯作者：
O. Sakai
影响因子：
3.8
作者：
Yoshihiro Nakamura;A. Iwai;O. Sakai
通讯作者：
Yoshihiro Nakamura;A. Iwai;O. Sakai
DOI：
10.1063/1.2956970
发表时间：
2008-07
期刊：
The Review of scientific instruments
影响因子：
--
作者：
Fridrik Magnus;Jon Tomas Gudmundsson
通讯作者：
Fridrik Magnus;Jon Tomas Gudmundsson