When I saw the title of this article, I began to wonder just how could they do that? Moreover, why would they even want to do that? 
Apparently making light follow a curved surface has some potential:
New form of light promises boost for photonic computing
another related article:
Liquid light switch bridges the gap between light and electricity
Just reading the 1st few paragraphs of this 2nd article makes me dizzy! Here is the 5th paragraph:
To create a Polariton Bose-Einstein condensate, laser light is first captured between mirrors in a microcavity just a few microns in size. Here the light interacts with thin sections of semiconductor material to produce a half-light, half-matter combination of quasi-particles known as a polariton, which are made up of semiconductor excitons (excited electrons bound to the hole produced by their excitation) and photons .
hmy: 
