In this paper the terahertz technology is briefly reviewed and terahertz sources, detectors, characteristics, application are discussed. There is increasing demand of unoccupied bandwidth for wireless communication and other new emerging applications. We know higher carrier frequency can allow fast transmission and reception of large amount of data. In recent years, Terahertz (THz) science and technology has shown great potential application and this field has entered a new phase of expansion in current technology and development field and has seen rapid progress. This article gives a brief overview of THz technology and summarizes the applications of THz technology.
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