Shrink Wrap Nanostructures -- Nickel Coating (image) The Optical Society Caption These are close-up images of the new shrink wrap nanostructures taken with a scanning electron microscope. Each image depicts the shrink wrap's surface with a fixed amount of nickel (5 nm) and different thicknesses of gold in the metal coating. The top is 10 nm thick. The middle is 20 nm thick. The bottom is 30 nm thick. The black arrows in the top image indicate a nanogap. Credit Optical Materials Express Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.