Meta material technique allows for high efficiency coupling of light on a surface AND the ability to switch direction via polarization

An electron micrograph shows the nanoscale perforations at the surface of the plasmonic coupler. Credit: Jiao Lin and Balthasar Müller.
( —A Harvard-led team of researchers has created a new type of nanoscale device that converts an optical signal into waves that travel along a metal surface. Significantly, the device can recognize specific kinds of polarized light and accordingly send the signal in one direction or another.

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Pretty important stuff, ducting light around on chips is an important ability for future electronics…or maybe one should say, nano- electro- optic- systems. Cool stuff…

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