Modulator (IMAGE) ETH Zurich Caption In the new modulator developed at ETH Zurich, millimeter wave signals (blue) are received by an antenna and converted into optical signals (red) inside the tiny slot in the middle. The device works without a power supply and is less than a millimeter in size. Credit ETH Zurich / Jürg Leuthold 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.