ABSTRACT
Introduction Terahertz imaging is a newly developed imaging technique that utilizes the terahertz region of the electromagnetic spectrum (Saeedikia 2013). The definition of terahertz region varies widely, and generally speaking, terahertz region spans the frequency range between the mid-infrared and the millimeter/microwave. The center portion of terahertz radiation (300 GHz to 3 THz) has an unique combination of many useful properties (Zeitler and Shen 2013): (1) like infrared radiation, terahertz radiation gives rise to individual “fingerprints” spectra for many crystalline materials including explosives and active pharmaceutical ingredients; thus, terahertz imaging can be used for material characterization and identification; (2) like microwave radiation, terahertz radiation can penetrate a wide variety of nonconducting materials including clothing, paper, cardboard, wood, masonry,
Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .115 Terahertz Imaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .117
