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Nature 452, 942-944 (24 April 2008) | doi:10.1038/452942a; Published online 23 April 2008
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Optics: Light reined in
Diederik Sybolt Wiersma1
Abstract
Light always travels at the same speed in a vacuum, no more, no less. But in materials, there's room for manoeuvre: tweak the right material in the right way, and exciting optoelectronic properties result.
In air, light travels at a speed of about 300,000 kilometres per second. That means it can circle Earth more than seven times in one second — so stupefyingly fast that we generally consider the arrival of light rays to be instantaneous.
- Diederik Sybolt Wiersma is at the European Laboratory for Nonlinear Spectroscopy (LENS) and INFM-BEC, Sesto-Fiorentino, 50019 Florence, Italy.
Email: wiersma@lens.unifi.it
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