Birch, J. R. Division of Electrical Science, National Physical Laboratory, Middlesex, United Kingdom.
Last reviewed:January 2021
- Incoherent radiation sources
- Coherent radiation sources
- Atmospheric transparency
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The generation, detection, and application of radiation in the submillimeter-wave region of the electromagnetic spectrum. In practical terms, this region corresponds to wavelengths between about 30 micrometers and 3 millimeters (Fig. 1). At its extremes the region overlaps with the microwave and infrared, and a unique feature is that the distinct propagation methods of these adjacent regions, guided-wave and free-space propagation, are used throughout it. See also: Electromagnetic radiation; Infrared radiation; Microwave
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