Compared to other parts of the spectrum, the application of terahertz waves is still in it's infancy. However, its ability to penetrate through many common non-metallic materials and provide material specific information has made terahertz waves a compelling option for non-destructive testing, and stand-off evaluation of materials (such as explosives detection). The following sections briefly describe some of the application areas that hold promise for THz applications:

• Security & Defense
• Non-destructive Testing & Evaluation
• Pharmaceutical
• Art Inspection

The above list is scratching the surface for THz applications, and if the history of adjacent bands of the spectrum are any guide, the most compelling applications are yet to come!