The recent development of easy-to-use sources and detectors of terahertz (Thz) radiation has enabled growth in applications of Thz imaging and sensing. This adaptable technology has great potential in a wide range of areas, and the Handbook of Terahertz Technology for Imaging, Sensing and Communications explores fundamental principles, important developments and key applications in this exciting field. Part One provides an authoritative introduction to the fundamentals of Thz technology. Generation, detection, and emission of waves are discussed as well as fundamental aspects of surface plasmon polaritons, Thz near-field imaging and sensing, room temperature Thz detectors, and Thz wireless communications. Part Two discusses recent progress and such novel techniques as Thz bio-sensing, array imagers, and resonant field enhancement of Thz waves. Fiber-coupled time-domain spectroscopy systems (THz-TDS), Thz photomixer systems, Thz nanotechnology, frequency metrology and semiconductor material development for Thz applications are all reviewed. Finally, applications of Thz technology are explored in Part Three, including applications in tomographic imaging and material spectroscopy, art conservation, and the aerospace, wood products, semiconductor, and pharmaceutical industries. The Handbook of Terahertz Technology for Imaging, Sensing and Communications is an authoritative guide to the field for laser engineers, manufacturers of sensing devices and imaging equipment, security companies, the military, professionals working in process monitoring, and academics.