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 triggered the search for new uses of terahertz waves in many fields, such as bioscience, security, and information and communications technology.

The book covers some of the technical breakthroughs in terms of device technologies. It...