Description:
<jats:p>The terahertz imagers that have already developed are usually with low frame rate and high cost, making them ineffective for moving target detection and fast imaging. Here, we experimentally report a high-frame-rate, high-resolution and low-cost real-aperture imager developed by combining the terahertz rainbow spectrum manipulation metasurface and quasi-optical method. As a wideband THz signal incidents on such metasurface (called as THz virtual prism), terahertz rainbow spectrum can be formed in one dimension just like a light beam passing through an optical prism, and complete real-aperture scanning imaging within 100 microseconds. By using high-speed displacement platform to realize another dimensional scanning, this imager will easily achieve high-frame-rate and high-resolution imaging with simple algorithm. The feasibility of this new THz imager was verified by imaging Siemens star and concealed targets, respectively. The results show that this imager has important potential applications in fields such as THz remote sensing, imaging radar, body scanner, etc.</jats:p>