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| 超宽带光电导天线的研究 |
| Research on ultra-wideband photoconductive antennas |
| 投稿时间：2025-02-24 |
| DOI：10.3969/j.issn.1005-5630.202502240031 |
| 中文关键词: 太赫兹 超宽带 光电导 螺旋天线 太赫兹双梳光谱 |
| 英文关键词:terahertz ultra-wideband photoconductive helical antenna terahertz double comb spectroscopy |
| 基金项目:国家重点研发计划(2023YFF0719200)；国家自然科学基金 (61988102) |
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| 中文摘要: |
| 传统的光电导天线太赫兹源一般采用的是偶极子结构，由于其窄带特性，限制了太赫兹源的工作带宽。同时，天线为准全向辐射模式，半功率点波束宽度大、方向性差，很大程度上影响了天线的实际应用。本文设计并制作了一种太赫兹超宽带光电导天线，该设计采用旋转角为90°的平面等角螺旋自互补天线结构，并在天线衬底背侧加载扩展半球透镜，旨在提升太赫兹辐射效率，并有效压缩太赫兹波的发散角。电磁仿真结果表明，该天线阻抗带宽覆盖0.1～1 THz频率范围，相对带宽163%（中心频率0.55 THz），天线增益在1 THz处达到最大(25 dB)。制备的天线对比于商用光电导天线(Teravil，EMT-8)，时域峰值信噪比提升了23%，辐射带宽从1.5 THz提升至2 THz，并且在整个带宽内动态范围更优。 |
| 英文摘要: |
| Conventional photoconductive antennas terahertz sources typically employ a dipole structure, due to its narrow-band nature, it limits the operating bandwidth of terahertz sources. Additionally, the omnidirectional radiation pattern results in a large half-power beamwidth (HPBW) and poor directionality, which significantly impede the practical application of the antennas. This study presents the design and fabrication of a terahertz (THz) ultra-wideband photoconductive antenna. The proposed design incorporates a planar equiangular spiral self-complementary antenna structure with a rotation angle of 90°, and an extended hemispherical lens is integrated on the backside of the antenna substrate. This configuration aims to significantly enhance the efficiency of THz radiation while substantially reducing the divergence angle of the THz waves. Electromagnetic simulation results indicate that the impedance bandwidth of the antenna spans from 0.1 to 1 THz, encompassing a relative bandwidth of 163% (with a center frequency of 0.55 THz). Moreover, the antenna gain achieves its peak value of 25 dB at 1 THz. The fabricated antenna demonstrates a 23% enhancement in the time-domain peak signal-to-noise ratio (SNR) compared to a commercial photoconductive antenna (Teravil, EMT-8). Additionally, it achieves an increase in the radiation bandwidth from 1.5 THz to 2.0 THz, along with a broader dynamic range across the entire bandwidth. |
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