Terahertz Spectrum Analyzer Based on Fourier Transform Interferometry

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 dependenc...

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Bibliographic Details
Published in:Journal of infrared, millimeter and terahertz waves millimeter and terahertz waves, 2019-09, Vol.40 (9), p.952-961
Main Authors: Iida, Hitoshi, Kinoshita, Moto, Tojima, Yuya
Format: Article
Language:English
Subjects:
Black body radiation
Classical Electrodynamics
Dependence
Electrical Engineering
Electronics and Microelectronics
Engineering
Fourier transforms
Frequency ranges
Instrumentation
Linearity
Mercury lamps
Power measurement
Spectrum analysers
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Summary: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.
ISSN:1866-6892
1866-6906
DOI:10.1007/s10762-019-00620-1