光电导天线太赫兹辐射峰值调控研究  

Research on terahertz radiation peak control of photoconductive antenna

作　　者：熊中刚 邓琥[1] 熊亮[1] 杨洁萍 尚丽平[1] Xiong Zhonggang;Deng Hu;Xiong Liang;Yang Jieping;Shang Liping(School of Information Engineering,Southwest University of Science and Technology,Mianyang 621010,China;School of Mechanical Engineering,Guilin University of Aerospace Technology,Guilin 541004,China)

机构地区：[1]西南科技大学信息工程学院,四川绵阳621010 [2]桂林航天工业学院机械工程学院,广西桂林541004

出　　处：《强激光与粒子束》2020年第3期80-87,共8页High Power Laser and Particle Beams

基　　金：国防基础科研计划项目(JCKY2018404C007);国防技术基础项目(JSZL2018204C002,JSZL2017404A001);四川省科技厅重点研发项目(2019YFG0114);广西自然科学基金资助项目(2019GXNSFBA185013)

摘　　要：针对微结构光电导天线与飞秒激光之间相互作用效应以及辐射太赫兹波调控问题进行了研究。采用德鲁德-洛伦兹理论模型获得微结构光电导天线辐射光电流密度,通过时域有限差分把光电流密度迭代在激励网格上,结合麦克斯韦方程求解时变电磁场,并通过传输线格林函数获得多层介质近场到远场的辐射太赫兹波,建立了辐射光电流与辐射阻抗、电磁共振模式之间的关系模型,模拟仿真分析了微结构S型光电导天线太赫兹波辐射调控机理。研究结果表明:微结构改变了天线等效模型的辐射阻抗;同时得知耦合系数不为零时存在耦合作用,且随着耦合系数增大共振频率峰值发生辐射增强和位移;并通过设计S型光电导天线获得辐射峰值频率调整范围为0.50~0.80 THz之间,对比工形天线辐射峰值频率由原来的0.40 T移动到0.76 T,频率调整度75%,峰值辐射效率约提高70%。该研究工作为后续高功率光导天线太赫兹波辐射的共振中心频点以及结构设计奠定重要基础。This paper studies the interaction effect between the micro-structure photoconductive antenna(PCA)and femtosecond laser, the control of radiated terahertz(THz) wave, and the radiation regulation mechanism of the THz wave for the photoconductive antenna(PCA). The Drude-Lorentz theory model is used to solve the photocurrent density, which is then iterated to the excitation grid by FDTD method. And then the time-varying electromagnetic fields is solved by Maxwell’s equations. The radiated THz wave from the near field to far field in the multi-layer medium is got through the Green’s Function of transmission line, and the relationship between the photocurrent and impedance of the radiation is established. At the same time, the relationship between the photocurrent and the magnetic resonance model is also established. The control mechanism of THz wave radiation from micro-structure Sshaped PCA is analyzed by simulation. The results show that the radiation impedance of the equivalent model is changed after split ring resonator(SRR) is introduced into the H-shaped PCA. Meanwhile, it is known that the coupling effect exists when the coupling coefficient is not zero. With the increasing of the coupling coefficient, and the radiation intensity of the resonance frequency peak increases and shifts. The adjusting range of the center frequency between 0.50-0.80 THz, the frequency modulation degree is 75%, and the peak radiation efficiency increases by 70% after simulating the S-shaped PCA. This work lays an important foundation for the design of THz wave resonance center frequency range and structure of high-power PCA.

关 键 词：太赫兹波 光电导天线 德鲁洛伦兹模型 电磁共振模式 辐射峰值 

分 类 号：TN201[电子电信—物理电子学]