Credit: Loughborough University
‌Top left: Photographic image of the cube with objects embedded in it. The pop-out image is a graphical sketch showing objects made of plastic, sugar and PTFE (a synthetic polymer) embedded at different depths. Top right: A 3D graphical sketch showing terahertz waves passing through the cube. Bottom: Real images captured by the terahertz wave camera. The images show objects embedded in the cube were detected at different depths. Image courtesy of Loughborough University.