Terahertz waves, which lie in the frequency range of 0.1-10 THz, have long been investigated in a few limited fields, such as astronomy, because of a lack of devices for their generation and detection. Several technical breakthroughs made over the last couple of decades now allow us to radiate and detect terahertz waves more easily, which has trigg

Photoconductive antennas. Nonlinear crystals. Quantum cascade lasers. THz diodes. THz transistors. Resonant tunneling diodes. Vacuum electronics. Plasma-wave devices. Metamaterials. Plastic fibers. THz information and signal processing. Low-coherent THz signals. Cameras. Chemical spectroscopy. Industrial applications. Wireless communications. Remote-sensing. 3D tomography system.