Let there be light - and it was directional: The world's first electrically powered Yagi-Uda antenna was built at the University of Würzburg's Department of Physics. Disclaimer: AAAS and EurekAlert!

A quantum dot drives an optical Yagi-Uda antenna giving a highly directed beam of single photons. This image relates to an article that appeared in the Aug. 20, 2010, issue of Science, published ...