SEM Image of the Device (image) Imperial College London Share Print E-Mail Caption This is a fabricated structure of W=25 nm and L=2μm with grating couplers and 30° tapers. The images were taken by scanning electron microscopy. Credit Nielsen et al., 2017/Imperial College London Usage Restrictions None Share Print E-Mail 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.