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The excitation of surface plasmons (SPs) with a strip grating at the boundary of an unmagnetized overdense plasma has been investigated theoretically and experimentally. An incident electromagnetic radiation was p-polarized at the frequency of 5 GHz. Experiments showed that when the plasma density was four times higher than the critical density with the grating present, and the SPs could be excited at the boundary of the overdense plasma. Contribution of the glass layer in the formation of the SP dispersion relation was examined. When the incident electromagnetic radiation was coupled into SPs the coupling order with the effective permittivity was simulated qualitatively. We find that the existence of SPs at the boundary of overdense plasma indicates that the reflection coefficient of the incident electromagnetic radiation reaches its minimum and even becomes total absorption. In this work the plasma density was diagnosed by a Langmuir double probe. 相似文献
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航天技术中的等离子体 总被引:1,自引:0,他引:1
等离子体是继固体、液体、气体之后物质的第四种形态。在这种物态中,存在一定数量的自由带电粒子,带电粒子间以及它们与电磁场的长程电磁相互作用使得等离子体有别于其他物质形态。等离子体的最常见形式是电离气体,能使气体电离的机制则是多种多样的。 相似文献
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低温等离子体灭菌方法与特点 总被引:10,自引:0,他引:10
随着高科技的发展,利用生物、光学、橡塑、光纤和晶体等材料研制的先进医疗诊断器械和物品不断出现.对这些材料,既不能用高温高压消毒处理,也不能简单地使用放射源、紫外、或其他化学方法灭菌,由此而引起的医疗事故一直是困扰国内外医学界的难题. 相似文献
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本文利用微波相位法和光谱诊断法, 研究了ICP放电等离子体在圆台状夹层等离子体中E模和H模相互转换的物理现象. E模和H模的之间转换过程是一个瞬间突变的, 转换点的输入功率随真空室压强的变化而变化. H模向E模转换的阈值功率低于E模向H模转换的值, 等离子体参数随输入功率变化曲线类似于铁磁物质中的磁滞回线. Ar II 408.2 nm谱线的强度的变化规律和电子密度随功率变化的规律基本一致. 通过本实验可以获得一种电子密度范围为3.85×1011 cm-3 < ne < 4.68× 1011 cm-3, 外表面积为0.3 m2, 厚度为2 cm稳定工作的等离子体源. 相似文献