Optical Security Feature (IMAGE) Optica Caption Researchers developed a two-part security feature that allows dynamic and reversible decryption. The figure illustrates an encrypted star pattern generated by raising the dielectric SiO2 layer by 10 nm. The star pattern is revealed when a thin-metal-coated elastomeric (PDMS) patch is applied. The star is 1 cm wide. Credit Gokhan Bakan, University of Manchester Usage Restrictions None License Licensed content 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.