Terahertz Spectrum Analyzer Based on Fourier Transform Interferometry
Terahertz Spectrum Analyzer Based on Fourier Transform Interferometry
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DOI：
10.1007/s10762-019-00620-1
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发表时间：
2019-08
期刊：
影响因子：
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通讯作者：
H. Iida;M. Kinoshita;Y. Tojima
中科院分区：
文献类型：
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作者：
H. Iida;M. Kinoshita;Y. Tojima
介绍了一种基于Martin-Puplett干涉仪的傅里叶变换太赫兹（THz）频谱分析仪，测量范围为0.1- 1.5THz。在室温下使用费米能级管理势垒二极管作为检测器实现了高动态范围。功率测量的频率依赖性的校正是通过假设黑体辐射使用高压汞灯来实现的。通过与使用古恩振荡器作为参考源的0.11 THz的校准功率计进行比较，确定绝对参考电平为1 mW。此外，通过测量不同功率水平下的参考衰减器来评估功率线性度。因此，在0.11、0.22和0.33 THz的频率下，在0.2-4.9 dB的线性范围内，动态范围被定量验证为高达45 dB。还演示了古恩振荡器的谐波测量。
A Fourier transform terahertz (THz) spectrum analyzer is demonstrated based on a Martin–Puplett interferometer in the frequency range of 0.1–1.5 THz. High dynamic ranges are achieved at room temperature using a Fermi level-managed barrier diode as the detector. Correction for the frequency dependence of power measurements is achieved using a high-pressure mercury lamp by assuming blackbody radiation. The absolute reference level is determined to be 1 mW by comparing with a calibrated power meter at 0.11 THz using a Gunn oscillator as a reference source. Moreover, the power linearities are evaluated by measuring the reference attenuator at different power levels. Consequently, dynamic ranges are quantitatively verified up to 45 dB within the linearity of 0.2–4.9 dB at frequencies of 0.11, 0.22, and 0.33 THz. Harmonics measurements of the Gunn oscillator are also demonstrated.