SPP Wave (VIDEO) Penn State This video is under embargo. Please login to access this video. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Caption A pulse-modulated SPP wave moving right, guided by the interface of a dielectric material (above) and a metal (below), suddenly encounters the replacement of the dielectric material by air. Most of the energy is transmitted to the air/metal interface but some is reflected to the dielectric/metal interface. The video spans 120 femtoseconds. Credit Akhlesh Lakhtakia, Penn State Usage Restrictions non commercial use only 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.