基于缺陷微波光子晶体的冷等离子体电磁参数诊断

Diagnosis of Cold Plasma Electromagnetic Parameters Based on Defective Microwave Photonic Crystal

等离子体特性电磁参数是研究等离子体应用技术的基础,为了精确地获取冷等离子体的电磁参数,提出一种基于等离子体缺陷微波光子晶体的冷等离子体电磁参数测量方法。利用传输矩阵法模拟了等离子体电磁参数与微波光子晶体缺陷透射峰的频率偏移量和峰值之间的关系。结果表明,等离子体缺陷微波光子晶体缺陷峰频率偏移量和峰值与等离子体频率和碰撞频率具有明确对应关系。因此,通过测量等离子体缺陷微波光子晶体缺陷透射峰频率偏移量和峰值,可以敏感地反演出被测等离子体的等离子体频率和碰撞频率。该方法的优势在于实现了等离子体电磁参数的非接触式和高灵敏度测量。

Plasma electromagnetic parameters are very important in development of plasma technology.In this paper,a testing method is presented based on a one-dimensional microwave photonic crystal with the cold plasma under test as a defective layer.The transfer matrix method(TMM)is used to simulate the relationship among plasma parameters,frequency offset of the defective peak,and the peak transmission intensity.The results indicate that the plasma and collision frequencies can be mapped into the frequency offset of the defective peak and the peak transmission intensity.Therefore,one can obtain the plasma electromagnetic parameter frequency by measuring the offset of the defective peak and the peak transmission intensity.This measuring approach provides a noncontact and sensitive way of sensing the electromagnetic parameters of cold plasma.