频率可调太赫兹微结构光电导天线

太赫兹波低频段辐射计在地球大气和分子探测中的需求不断增加。在微波电开口谐振环等效电路模型及其谐振特性仿真设计的基础上, 将微波谐振结构和传统带状线偶极子光电导天线结合, 提出了新型微结构光电导天线, 具有频率调节灵敏度高、谐振特性明显的优点。加工了不同尺寸的新型光电导天线和常规的带状线偶极子光电导天线实物, 并进行了实验对比研究。两种类型的太赫兹辐射频谱明显不同, 新型光电导天线由于微结构电开口谐振环的双频谐振特性出现了两个谐振峰, 3 dB相对带宽约为50%, 得到了窄带特性; 而传统光电导天线只有单峰, 3 dB相对带宽为93.07%, 显然为宽谱特性。对于新型光电导天线的仿真和实测吻合较好, 调节微结构天线的谐振环臂长可以获得较大的峰值频率移动相对值, 从而也验证了理论模型、谐振单元仿真结果的有效性。

Abstract

There are increased application requirements of Terahertz wave low frequency radiometers in Earth atmosphere and molecular detection. Based on the equivalent circuit model and their resonant characteristics′ simulation design of the microwave electrical split ring resonators(eSRR), novel microstructured photoconductive antennas(PCAs) were proposed by combining the microwave resonant structure with the traditional stripline dipole PCA. The new PCAs were with high frequency adjustment sensitivity and obvious resonance characteristics. The novel PCAs with different dimensions were fabricated and experimentally compared with a conventional stripline dipole PCA. The terahertz radiation spectrum of the two types PCAs are significantly different: the novel PCAs have dual resonant peaks and narrowband resonating characteristics owing to the dual-frequency resonant characteristics of the microstructured eSSRs, and the 3 dB relative bandwidth is about 50%; while the conventional PCA has only a single peak with broad spectrum radiations, whose the 3 dB relative bandwidth is 93.07%. The simulation and test results of the new PCAs agree well. It is demonstrated that adjusting the resonant ring′s arm length of the new PCAs can obtain a relatively larger peak frequency shift. Thus the theoretical model and the simulation results are all verified.

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夏祖学, 刘发林, 邓琥, 陈俊学, 刘泉澄. 频率可调太赫兹微结构光电导天线[J]. 红外与激光工程, 2018, 47(5): 0520002. Xia Zuxue, Liu Falin, Deng Hu, Chen Junxue, Liu Quancheng. Frequency adjustable THz microstructured photoconductive antennas[J]. Infrared and Laser Engineering, 2018, 47(5): 0520002.

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