We propose a scheme of terahertz (THz) indirect detection via plasmonic-antenna enhanced sum frequency generation process, where the THz wave is converted to optical wave that is detected by photodetector. The gold antenna built in the structure can improve the conversion efficiency by enhancing both the optical wave and THz wave. The numerical simulations show that the field enhancement is influenced by the geometry of the antenna, so the conversion efficiency can be improved highly by optimizing the antenna. Compared with commercial detectors, our detection system has a much lower noise equivalent power (NEP) of 15.4pW/Hz at 5THz.

中文翻译：

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等离子天线增强和频产生的太赫兹波检测

我们提出了一种通过等离子体天线增强的和频生成过程进行太赫兹（THz）间接检测的方案，其中太赫兹波被转换为光波，由光电探测器检测到。该结构中内置的金天线可以通过增强光波和太赫兹波来提高转换效率。数值模拟表明，场增强受天线几何形状的影响，因此通过优化天线可以大大提高转换效率。与商业检测器相比，我们的检测系统的噪声等效功率 (NEP) 低得多，为 15.4功率/赫兹在5太赫兹。