Interaction and control of millimetre-waves with microplasma arrays
Interaction and control of millimetre-waves with microplasma arrays
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DOI：
10.1088/0741-3335/47/12b/s45
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发表时间：
2005-12
影响因子：
2.2
通讯作者：
O. Sakai;T. Sakaguchi;Yosuke Ito;K. Tachibana
中科院分区：
文献类型：
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作者：
O. Sakai;T. Sakaguchi;Yosuke Ito;K. Tachibana
电磁波在几种类型的微等离子体中的传播已经在 10-75 GHz 频率范围内进行了实验检查。首先，使用微等离子体组件的平面几何形状研究了传播的基本特征，并通过使用具有碰撞效应的德鲁德型模型的理论分析与透射率的比较来推导电子密度。其次，在二维周期性微等离子体阵列中观察到聚焦效应等异常传播现象。这种反常折射不能仅仅通过基于体等离子体介电特性的预测来解释，并且表明类光子晶体周期性介电结构可能发挥重要作用。第三，证明了微等离子体与微带线连接形成的T形结可以控制微波的传输。通过在直角处连接到带状线的一系列两个 T 形结获得了约 35% 的衰减（或调制）深度。所有上述特征都来自于（a）1013 cm−3附近微等离子体相对较高的电子密度，（b）具有碰撞效应的复杂色散关系，以及（c）具有与微波波长相同数量级的特征尺度的空间排列。
Propagation of electromagnetic waves in several types of microplasmas has been examined experimentally in a frequency range 10–75 GHz. Firstly, the fundamental characteristics of the propagation were investigated using a planar geometry of microplasma assembly, and the electron density was derived by a comparison of the transmittance with the theoretical analyses using a Drude type model with collisional effects. Secondly, an extraordinary propagation phenomenon such as the focusing effect was observed in a two-dimensional periodical microplasma array. This kind of anomalous refraction cannot be interpreted only by predictions based on the dielectric property of bulk plasma, and it is suggested that a photonic-crystal-like periodical dielectric structure may play a significant role. Thirdly, it was demonstrated that the T-junction formed by a microplasma connected to a microstrip line can control the transmission of microwaves. An attenuation (or modulation) depth of about 35% was obtained with a series of two T-junctions connected to the strip line at the right-angled corners. All the above features come from (a) the relatively high electron density of the microplasmas near 1013 cm−3, (b) the complex dispersion relation with collisional effects and (c) the spatial arrangement with a characteristic scale of the same order of the wavelength of microwaves.