一维微等离子体光子晶体的太赫兹带隙特征调控  

Tunability of the Terahertz Bandgap of One-dimensional Microplasma Photonic Crystals

作　　者：杨璐[1] 陈玉秀 吴淑群[1] 刘旭晖 欧阳帆 张潮海 YANG Lu;CHEN Yuxiu;WU Shuqun;LIU Xuhui;OUYANG Fan;ZHANG Chaohai(College of Automation Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学自动化学院,南京210016

出　　处：《高电压技术》2021年第3期865-875,共11页High Voltage Engineering

基　　金：国家自然科学基金(51977110)。

摘　　要：调控太赫兹波传播是太赫兹技术应用的基础。从麦克斯韦方程组和电子动量守恒方程出发,推导了等离子体的相对介电系数和电导率。在此基础上,从理论和仿真两个层面,论证了一维微等离子体光子晶体(MPPC)用于太赫兹带隙特征调控的可行性,结果表明:在无缺陷的一维MPPC中,当电子数密度低于1015 cm-3时,电子数密度的改变对第一太赫兹禁带影响较微弱;当电子数密度从1015 cm-3继续升高到1016 cm-3时,第一禁带的中心频率向高频偏移110 GHz,第一禁带的宽度增加约200 GHz。气压从50.5 kPa增大到202 kPa,第一禁带的中心频率从0.871THz下降到0.79THz。在含单个缺陷的一维MPPC中,当电子数密度从1014 cm-3增加至1015 cm-3时,窄通带的中心频率偏移约24 GHz。由此可见,在光子晶体中引入微等离子体后,其能够对太赫兹波传播进行调制。Controlling the propagation of the terahertz waves is important for the application of terahertz technology. This work starts from Maxwell’s equations and electron momentum conservation equations and derives the relative permittivity and conductivity of plasma. The feasibility of microplasma photonic crystal(MPPC) for terahertz band gap feature control is demonstrated in theory and simulation. The results show that, in flawless MPPC, when the electron density is lower than 1015 cm-3, the change of electron density has a negligible effect on the first terahertz band gap. When the electron density continues to rise from 1015 cm-3 to 1016 cm-3, the central frequency of the first forbidden band shifts 110 GHz to the high frequency. When the air pressure increases from 50.5 kPa to 202 kPa, the central frequency of the first band gap decreases from 0.871 THz to 0.79 THz. In MPPC with single defect, when the electron density increases from 1014 cm-3 to 1015 cm-3, the central frequency of narrow passband shifts about 24 GHz. It can be seen that the propagation of the terahertz wave can be tuned by the microplasma photonic crystals.

关 键 词：太赫兹波 微等离子体光子晶体 禁带特性 窄通带 微等离子体 

分 类 号：O441.4[理学—电磁学] O734[理学—物理]