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Terahertz Spectrum Analyzer Based on Fourier Transform Interferometry

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Abstract

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.

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Funding

This work was supported by JSPS KAKENHI Grant Number JP19K04418 and JP18H01457.

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Authors and Affiliations

  1. National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki, 305-8563, Japan

    Hitoshi Iida, Moto Kinoshita & Yuya Tojima

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  1. Hitoshi Iida
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  2. Moto Kinoshita
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  3. Yuya Tojima
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Correspondence to Hitoshi Iida.

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Iida, H., Kinoshita, M. & Tojima, Y. Terahertz Spectrum Analyzer Based on Fourier Transform Interferometry. J Infrared Milli Terahz Waves 40, 952–961 (2019). https://doi.org/10.1007/s10762-019-00620-1

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  • DOI: https://doi.org/10.1007/s10762-019-00620-1

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