TERAHERTZ ELECTRIC FIELD IMAGING.

The article focuses on imaging system based on terahertz radiation. Terahertz radiation lies between microwave and infrared frequencies. It has widespread potential applications in medicine, microelectronics, agriculture, forensic science. Coherent terahertz time-domain spectroscopy that has an ultrawide bandwidth provides a new method for characterizing the electronic, vibronic, and compositional properties of solid, liquid, and gas phase materials, as well as flames and flows. In an imaging system that bas a single terahertz antenna, the image is obtained by pixel-scanning the sample in two dimensions done with the help of free-space electro-optic detection.