Photon Sieve (IMAGE) NASA/Goddard Space Flight Center Caption A photon sieve's close-up reveals a crisp honeycomb pattern of the support structure, and in the central hexagon a circular arrangement of slits cut through the glass which gets smaller with each successive ring. Credit NASA / Christopher Gunn Usage Restrictions No restrictions. License Public Domain 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.