13- by 13-Millimeter Measurement (IMAGE) American Institute of Physics Caption A 13- by 13-millimeter measurement for each of the 169 possible locations of the signal input location of the waveguide. These measurements reveal multiple maxima in each 13x13 spot, confirming a superposition of modes in the signal propagating through the waveguide. Credit Image courtesy of the authors 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.