Terahertz circuits, systems, and imaging instruments

Due to the rapid progress in the design and fabrication of terahertz circuits, it is now possible to develop highly integrated terahertz imaging systems for various applications. Passive and active imaging systems are built for possible usage in contraband detections and other security related applications. They are also being considered for different scientific imaging applications, such as orbital debris and sand dynamics. We present here the review of the current status of solid-state terahertz circuits that are available for imaging instrument developments and describe some imaging radar measurements for scientific applications.