张李伟, 尚丽平, 唐金龙, 夏祖学, 邓琥. 34μm孔径GaAs偶极子光电导天线辐射特性仿真研究[J]. 红外与激光工程, 2013, 42(1): 108-112.
引用本文: 张李伟, 尚丽平, 唐金龙, 夏祖学, 邓琥. 34μm孔径GaAs偶极子光电导天线辐射特性仿真研究[J]. 红外与激光工程, 2013, 42(1): 108-112.
Zhang Liwei, Shang Liping, Tang Jinlong, Xia Zuxue, Deng Hu. Simulation of radiation characteristics of 34 μm aperture GaAs dipole photoconductive antenna[J]. Infrared and Laser Engineering, 2013, 42(1): 108-112.
Citation: Zhang Liwei, Shang Liping, Tang Jinlong, Xia Zuxue, Deng Hu. Simulation of radiation characteristics of 34 μm aperture GaAs dipole photoconductive antenna[J]. Infrared and Laser Engineering, 2013, 42(1): 108-112.

34μm孔径GaAs偶极子光电导天线辐射特性仿真研究

Simulation of radiation characteristics of 34 μm aperture GaAs dipole photoconductive antenna

  • 摘要: 光电导天线的辐射特性仿真是设计和制造光电导天线的重要依据。将蒙特卡洛经验公式修正的GaAs迁移率随电场强度的变化关系引入德鲁德-洛伦兹模型,分析了光电导天线载流子输运情况。又将德鲁德-洛伦兹模型计算的光生载流子密度与时域有限差分方法相结合,得到34 m孔径GaAs偶极子光电导天线的时域、频域及三维辐射特性。辐射峰值为0.8 THz,频谱宽度大于1 THz,与太赫兹时域光谱系统实际测量得到的数据吻合。结果表明:仿真方法正确可行,能够为设计和制造高增益、宽频带的太赫兹光电导天线提供参考依据。

     

    Abstract: Simulation characteristics of photoconductive antenna(PCA) radiation are the important basis for design and manufacture of photoconductive antenna. The method introduced the relationship between Monte-Carlo empirical-formula and updated GaAs migration-rate versus electric-field strength. The photo-generated carrier-density of 34 m-apeture GaAs dipole photoconductive antenna was computed based on Drude-Lorentz model. Combining the photo-generated carrier-density with finite difference time domain(FDTD) method, time-domain, frequency-domain and three-dimensional radiation characteristics were simulated. The frequency spectrum of the terahertz radiation ranged about 1 THz, and its amplitude peaks were at roughly 0.8 THz, which consisted well with the data obtained from terahertz time-domain spectrum system(THz-TDS). The results show the feasibility of this method, which provides a reference for design and manufacture of the high-gain, wideband THz photoconductive antenna.

     

/

返回文章
返回