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Simple nanoantenna separates colors of light

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Ashley N. Paddock, [email protected]

A new nanoantenna directs red and blue colors in opposite directions and could lead to optical nanosensors that can detect very low concentrations of gases or biomolecules. Historically, a structure that is smaller than the wavelength of visible light (390 to 770 nm) should not be able to scatter light, but that is precisely what the new nanoantenna from Chalmers University does. Researchers there found that the trick is to build an antenna with an asymmetric material composition, creating optical phase shifts. The antenna comprises two nanoparticles — one silver, one gold...Read full article

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