I don't get it but apparently German scientists managed to stop, or I suppose "arrest", light for one full minute. In light speed, that's about 18-million kilometres.
While light normally travels at just under 300 million metres per second in a vacuum, physicists managed to slow it down to just 17 metres per second in 1999 and then halt it completely two years later, though only for a fraction of a second. Earlier this year, researchers kept it still for 16 seconds using cold atoms.
To break the minute barrier, George Heinze and colleagues at the
University of Darmstadt, Germany, fired a control laser at an opaque
crystal, sending its atoms into a quantum superposition of two states.
This made it transparent to a narrow range of frequencies. Heinze's team
then halted a second beam that entered the crystal by switching off the
first laser and hence the transparency.
Wow, it's so simple. Why didn't I think of that? We probably won't hear much about this until the U.S. military figures out how to weaponize it.
1 comment:
I can envision cosmetic applications. I know I certainly wouldn't mind stopping time, right around my eyes especially.
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