## An introduction to metamaterials (with pretty animated graphics)

This is a repost of an article I wrote at my old blog. It’s still fairly relevant, and metamaterials is a topic I hope to spend more time discussing. The most intuitive place to start discussing metamaterials is generally index of refraction and Snell’s Law. Most people are familiar with the refraction of light by lenses…or at least I certainly hope so! If not, you may want to check out this tutorial on lenses and come back when you’re done. One of the formulas the defines the refraction of light at an interface (for linear optics anyway) is Snell’s Law. Mathematically, this is written as: What this means is that there is a relationship between the angle of the light leaving one material and the angle at which is enters the second material. When the light is in the first material, we call it in the incident beam and give…