Scientists engineer a surface to trap a rainbow: By focusing light along this plasmonic structure, the series of grooves, or nano-gratings, slowed each wavelength of optical light. The individual colors of the visible spectrum were captured at different groove depths along the grating, resulting in a trapped rainbow of light.
Through direct optical measurements, the team showed that wavelengths of light in the 500-700nm region were “trapped” at different positions along the grating, consistent with computer simulations.
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