Electron Microscope Pictures of the Micro-spectrometer (image) Eindhoven University of Technology Share Print E-Mail Caption The upper picture shows the entire device; the large yellow areas are contact pads. The lower picture shows the perforated membrane, and the inlay zooms in on the photonic crystal cavity (the area without holes). Credit Eindhoven University of Technology. 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.