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Nature 417, 132-133 (9 May 2002) | doi:10.1038/417132b

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Applied physics: Bridge for the terahertz gap

Carlo Sirtori

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A device has been invented that produces radiation in the terahertz range. It is a considerable feat of semiconductor fabrication, and could be used in a wide range of applications.

In modern communications, information is transmitted by modulating either the amplitude or the frequency of electromagnetic waves. But not all of the electromagnetic spectral range can be exploited for this purpose, a deficiency that is addressed by Köhler et al. on page 156 of this issue1.