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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