Dynamic Plasma/Metal/Dielectric Crystals (IMAGE) American Institute of Physics Caption Dynamic plasma/metal/dielectric crystals are able to filter electromagnetic signals in the 100-300 GHz range, transmitting desired frequencies at any given moment of time. White light impinging on the crystals symbolizes broadband mm-wave signals that are filtered by the crystals, allowing only narrowband radiation (symbolized by red, green, or blue beams) to exit the crystal. Credit Image courtesy of the University of Illinois Usage Restrictions Journalists may use this image only with appropriate credit. 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.