The characteristics of plasmons in nonuniform plasma are studied. It is found that plasmons can be supported by the interface between two plasma having different plasma frequencies, while their frequencies depend on the ratio of the lower plasma frequency to the higher plasma frequency. Interestingly, when the ratio is about 1, the frequencies of plasmons are equal to these plasma frequencies approximately. Some experimental evidences are shown to prove the existence of the plasmon polarizations in the nonuniform plasma, and a new plasma diagnostic method based on this conclusion is proposed, and is used to obtain the plasma density distribution of a cylindrical plasma with Bessel function electron density distribution as well as Epstein electron density distribution. The inverted results are in good agreement with the given distribution. These studies pave the way for a possible tool of plasma diagnostic, as well as the microwave applications based on plasma.

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非均匀等离子体表面等离子体极化的研究

研究了非均匀等离子体中等离子体的特性。发现等离子体可以由具有不同等离子体频率的两个等离子体之间的界面支持，而它们的频率取决于较低等离子体频率与较高等离子体频率的比率。有趣的是，当比率约为 1 时，等离子体的频率大约等于这些等离子体频率。一些实验证据证明了非均匀等离子体中等离子体极化的存在，并基于该结论提出了一种新的等离子体诊断方法，并用于获得具有贝塞尔函数电子密度分布的圆柱等离子体的等离子体密度分布以及爱泼斯坦电子密度分布。反演结果与给定的分布非常吻合。