Nov 2 2009
Whether it's Harry Potter or Star Trek, Hollywood scriptwriters have recognised the storytelling appeal of the 'invisibility cloak'. While most of us are simply happy with the thrill of special effects, one scientist has been inspired to try and make these cinematic fantasies real. Thanks to The Royal Society's Theo Murphy Blue Skies Award, Professor Ulf Leonhardt, who holds the Chair in Theoretical Physics at The University of St Andrews, will spend the next two years working on a blueprint for a cloaking device.
Bending of light
Leonhardt's interest in this field goes back to his days studying at the University of Um in Germany, (coincidentally Einstein was born in Um) and wanted to teach a course on Special Relativity and General Relativity. 'But I had never learned General Relativity myself,' he explains, 'I never attended a course, I learned by giving a course! I looked for connections between my research area which is Optics in general, and General Relativity, and this got me into this field.' Leonhardt's work approaches the idea of invisibility, through looking at optical illusions brought about by the bending of light. For example, in the desert, light rays from the sky are bent in the thin air above the sand, creating an apparent image of water. Another example of illusion created by the bending of light is when we see a fish in water. We don't see exactly where the fish is, as the water surface refracts the light coming from the fish.
Go online now for the full article on 'The Science of Invisibility Cloaks' in the November edition of cubed: http://www.britishcouncil.org/science-cubed.htm