Smallest-ever optical switch revolves around one atom
It's actually smaller than the light beam it needs to work. We've seen some ridiculously tiny electronics in our day, but this might take the cake. Swiss researchers have built an optical networking switch so small that it's measured on the atomic scale -- in fact, it's smaller than the wavelength of light it needs to transmit data. The system can use just one silver atom to transmit an electrical current between silver and platinum pads. Apply enough voltage and the atom moves into place...
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