PerspectiveApplied Physics

Toward Bridging the Terahertz Gap with Silicon-Based Lasers

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Science  29 Apr 2005:
Vol. 308, Issue 5722, pp. 638-639
DOI: 10.1126/science.1109831

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Summary

A laser emitting at terahertz wavelengths (30 to 300m or 1 to 10 THz) would be highly useful in medical and security applications, but current terahertz lasers are complex and expensive. In his Perspective, Borak discusses recent advances toward building a more practical, silicon-based terahertz laser, which would be compatible with the ubiquitous silicon technology. Currently, so-called quantum cascade lasers look like most promising, but a working silicon quantum cascade laser is still some way off.