Review of methods for performance evaluation of antenna-coupled THz detectors

This contribution presents an overview of main methods what are currently used for the sensitivity, i.e., responsivity and noise equivalent power determination of state-of-the-art antenna-coupled field-effect-transistor-based THz detectors/sensors. We show that, the reported results strongly depend on the sensor effective area determination method, especially if it is not unambiguously determined leading to up to orders of magnitude discrepancy. Furthermore we illustrate our statements by presenting results of characterisation of detectors which are coupled with different antennas and presenting state-of-the-art sensitivity values.