基于光纤光子晶体的高增益太赫兹光电导天线
High Gain THz Photoconductive Antenna Based on the PhotonicCrystal Fiber
  
DOI:
中文关键词:  光电导天线,太赫兹,光子晶体,高阶模式,高增益
英文关键词:photoconductive antenna, terahertz (THz), photonic crystal, higher-order mode, high gain
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作者单位
毛浩为,逯贵祯 中国传媒大学 信息与通信工程学院,北京 100024 
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中文摘要:
      研究了一种基于光纤光子晶体的高增益太赫兹光电导天线,利用腔体的高阶模式实现天线高增益。 首先,基于提出的光纤光子晶体高阶模式场分布,对光电导天线的辐射方向图进行有效预测分析。该高阶模式近似 于圆柱介质波导的HE11m 模式(m>1),可以同时调整光纤光子晶体高度与谐振频率,改变高阶模式的纵向场分布。 接着,利用介质波导理论,给出了光纤光子晶体在给定范围内谐振频率的解析计算方法。最后,对工作在上述高阶 模式下的光纤光子晶体光电导天线进行数值仿真分析。工作在HE118 模式下,光纤光子晶体高度为250 μm 的光电 导天线方向性可以达到15. 33 dBi。相比于传统基于半球硅透镜的太赫兹光电导天线,方向性提高了约3. 5 dBi。根 据仿真结果得出,在一定范围内利用光纤光子晶体的高阶模式,太赫兹光电导天线的增益可以明显提高。
英文摘要:
      This work presents a high gain THz photoconductive antenna based on photonic crystal fiber. The high gain of the antenna is realized by using the higher-order mode of the cavity. Based on the field configurations within the proposed photonic crystal substrate mode,the radiation pattern of the photoconductive antenna is predicted and analyzed effectively. The proposed higher-order mode is approximate to HE11m of cylindrical dielectric waveguides (m>1). The change of longitudinal field distribution is achieved by adjusting the resonant frequency and the height of the photonic crystal fiber. Next, considering dielectric waveguide theory, the analytical calculation method of the resonant frequency of the substrate within the given range is presented. Finally, based on finite element method (FEM) the numerical simulations to the THz photoconductive antennas in the above high-order mode are taken. In HE118 mode, the directivity of the antenna can reach 15. 33 dBi when the height is 250 μm. Compared with the traditional THz photoconductive antenna based on hemispherical silicon lens, the directivity is improved by about 3. 5 dBi. According to the simulation results, the enhancement of the THz photoconductive antenna gain can be achieved by using the higher-order mode of photonic crystal fiber within limits.
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