27 Feb '14, 7pm

Nanotubes Make Logic Circuits that Use Both Light and Current

Nanotubes Make Logic Circuits that Use Both Light and Current

Engineers trying to speed up communication between computer chips have been working on using beams of light to replace the copper traces that shuttle data between microprocessors. Now a pair of researchers at Northeastern University in Boston think they can turn up the speed even more by doing some of the computing with light as well. Physicist Swastik Kar and mechanical engineer Yung Joon Jung lay belts of carbon nanotubes on top of a silicon wafer. The junction created by the intersection of the two materials proved to be highly sensitive to light; shining a laser spot on it caused a sharp rise in the light-induced current. That allowed the pair to build logic circuits that could be manipulated both electrically and optically. “What we’ve done is built a tiny device where one input can be a voltage and the other input can be light,” Kar says. The researchers built an opt...

Full article: http://spectrum.ieee.org/tech-talk/semiconductors/optoele...

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