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Metamaterial a One-Way Street for Visible Light

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A structure based on hyperbolic metamaterials allows visible light to pass in only one direction, creating new possibilities for optical circuits and biosensing. Developed at the National Institute of Standards and Technology, the device integrates a silver and silicon dioxide glass nanostructure with sub-wavelength diffractive gratings made of chromium. The 20-layer nanostructure, created using thin-film deposition techniques, is opaque to external light but allows light to propagate inside over a narrow range of angles. A grating on one face of the nanostructure bends incident...Read full article

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