Sensing with Terahertz Radiation. This item is unavailable.Sensing with Terahertz Radiation

One aspect of the field of THz radiation is the marriage of microwave and optical techniques. By its very nature, THz radiation bridges the gap be­ tween the microwave and optical regimes. The former can be characterized by the fact that most devices are comparable in size to the wavelength of the radiation. As a result, the propagation of energy in these devices is generally in the form of single-mode or low-order-mode guided waves. In contrast, the optical and infrared ranges are generally characterized by beams containing many modes, with dimensions much larger than the wavelength. Of course, there are exceptions to these rules, notably the single-mode propagation of optical radiation in fibers. Nonetheless, the general description holds true. Because of these fundamental differences, it is natural that the techniques used in their implementation are quite distinct. Much of the research in the THz field has been based on the melding of these disparate ideas.

Sensing with Terahertz Radiation reviews the state of the art in the generation, manipulation, and detection of electromagnetic radiation in the terahertz range. Recent years have seen a tremendous growth in research and development efforts in this spectral regime, spanning roughly from 0.3 THz to 10 THz. This has been spurred in part by several startling advances, involving non-linear optical materials, ultrafast optical and electronic techniques, and spectroscopic methods. As a result, there have been qualitative and significant improvements in the generation and detection of THz radiation. These have enabled a number of "real world" applications of THz technologies, in a manner which would not have been practical only a few years ago. A number of demonstrations and feasibility tests are discussed, which serve as compelling evidence of the utility of such techniques. Owing to the unique characteristics of THz radiation and its interactions with materials, these methods can have substantial advantages over other more conventional technologies. This text includes contributions on topics including time-domain spectroscopy based on both photoconductive and electro-optic sampling, photomixing, and all-electronic THz generation. advantages over other, competing technologies in a number of different areas.