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Compared with adjacent microwaves and infrared frequencies, terahertz (THz)frequency offers numerous advantages for imaging applications. The unique THzspectral signatures of chemicals allow the development of THz imaging systemsfor nondestructive tests and the evaluation of biological objects, materials,components, circuits, and systems, which are especially useful in the security,medical, material, pharmaceutical, aeronautical, and electronics industries.However, technological advancements have been hindered owing to the lack ofpower-efficient and compact THz sources. Here, we use high-temperaturesuperconducting monolithic sources known as Josephson plasma emitters(JPEs)-which are compact, chip-integrated coherent and monochromatic sources ofbroadly tunable THz waves-and report the art of non-destructive imaging ofconcealed metallic surgical blades, floppy disks, dandelion leaves, and slicesof pork meat in the THz spectral range. The quality of the images, exhibitinghigh-contrast differentiation between metallic and non-metallic parts, makingdifferent features of objects visible, and targeting different powders,demonstrates the viability of this THz imaging system for nondestructive,contactless, quick, and accurate environmental monitoring, security, medicine,materials, and quantum science and technology applications.

Terahertz imaging system with on-chip superconducting Josephson plasma emitters for nondestructive testing