Home > Uncategorized > Optical switches for future optical computers–very cool stuff from Cornell

Optical switches for future optical computers–very cool stuff from Cornell


Small optical force can budge Nano scale objects

By Bill Steele

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Cornell Nanophotonics Group

Scanning electron micrograph of two thin, flat rings of silicon nitride, each 190 nanometers thick and mounted a millionth of a meter apart. Light is fed into the ring resonators from the straight waveguide at the right. Under the right conditions optical forces between the two rings are enough to bend the thin spokes and pull the rings toward one another, changing their resonances enough to act as an optical switch.

With a bit of leverage, Cornell researchers have used a very tiny beam of light with as little as 1 milliwatt of power to move a silicon structure up to 12 nanometers. That’s enough to completely switch the optical properties of the structure from opaque to transparent, they reported.

The technology could have applications in the design of micro-electromechanical systems (MEMS) — nanoscale devices with moving parts — and micro-optomechanical systems (MOMS) which combine moving parts with photonic circuits, said Michal Lipson, associate professor of electrical and computer engineering.

From <http://www.news.cornell.edu/stories/Nov09/lightswitch.html>

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