The Absorbing Properties of Two-Dimensional Plasma Photonic Crystals

Plasma photonic crystals composed of periodic plasma and dielectric materials have attracted considerable attention because of their tunable photonic band gaps,but only their band structures or negative refractive index properties have been addressed in previous works.In this paper,through studying the transmission and reflection characteristics of two types of twodimensional plasma photonic crystals,it is found that plasma photonic crystals play an important role in absorbing waves,and they show broader band and higher amplitude absorption characteristics than bulk plasmas.Also,the absorption of plasma photonic crystals can be tuned via plasma parameters;varying the collision frequency can make the bandwidth and amplitude tunable,but cannot change the central frequency,whereas varying the plasma frequency would control both the location and the amplitude of the absorbers.These features of plasma photonic crystals have potential for terahertz tunable absorber applications.

基于缺陷微波光子晶体的冷等离子体电磁参数诊断

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。