What is THz?

Terahertz (THz) light is located between the microwave and infrared regions of the electronic spectrum. The wavelength of THz light ranges from approximately 1 mm (at 300 GHz) to 30 µm (at 10 THz). The THz frequency range has been referred to as the “last frontier” of the electromagnetic spectrum due to the historical difficulty in producing and detecting it.


THz RangeElectromagnetic spectrum between microwave and IR; 60 GHz to 3 THz; 5 mm to 100 µm.

THz imaging is important because not only can it penetrate materials like x-rays, but the radiation is non-harmful.

Additionally, THz waves contain a wealth of information that allow immediate identification of materials and compounds. These include:

  • Looking through clothing for concealed weapons
  • Identifying materials such as explosives and contraband
  • Evaluating individual thicknesses of multi-layered dielectric structures
  • Identifying cancerous breast and skin tissue

Due to the long-standing difficulty in generating stable THz sources (THz is faster than traditional electronics and too slow for optical materials), THz applications have been used in a few specially-equipped research labs and have seen limited commercial success.

Traycer is changing the THz landscape.