In this Letter, we experimentally demonstrate nonlinear optical negative refraction in thin metallic nanostructures. We use a degenerate four-wave mixing (4WM) process to show efficient frequency ...

Add Yahoo as a preferred source to see more of our stories on Google. There are many glorious science-based terms when it comes to surfing. We all talk about swells, of course, the underwater energy ...

Google Earth provides a cornucopia of exotic images of our planet taken from above. For the most part, the focus of attention is on the land and the cities, roads and natural formations that it ...