A Methodology to Measure Input Power and Effective Area for Characterization of Direct THz Detectors


This paper presents a check setup and measurement methodology for the characterization of direct terahertz (THz) detectors. The detector below test is illuminated by a nonstop wave THz source and its voltage response is measured using a lock-in amplifier. A reference detector is used to live the input power density of the receiver antenna. The calculation of the effective space is completed by measuring and plane radiation patterns of the receiver antenna. Several measurement techniques are shown so as to attain a reliable characterization of the detector with completely different benefits and drawbacks. Additionally, a setup modification is done for the removal of the electronically induced background noise due to the coupling of the signals through cables. Based mostly on the measured input power, the performance parameters of an antenna-coupled field-result transistor (FET)-based THz detector are measured and presented. This measurement methodology can also be used to characterize other direct THz detectors.

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