... among them, perhaps, security and surveillance products, military hardware, wind turbines and Ashton Kutcher!
Fischer and his colleague Tolga Ergin have for the past year worked with colleagues at at the Karlsruhe Institute of Technology's Center for Functional Nanostructures [CFN] on refining the structure of the 'invisibility cloak' to such an extent that it is also effective in the visible spectral range.
Based on theoretical calculations, first attempts were started to produce such a material artificially. Among the early investigators were Sir John B Pendry (Imperial College, London, UK) and David R Smith (Duke University, Durham, North Carolina, USA and Imperial College UK), both of whom published the results obtained for an invisibility cloak for radar waves in 2006.
In 2008, Jensen Li (City University of Hong Kong) and Sir John B Pendry presented the theoretical idea of a carpet invisibility cloak. In 2010, Karlsruhe's Professor Martin Wegener and his team presented their first 3D invisibility cloak.
In invisibility cloaks, light waves are guided by the material so that they leave the invisibility cloak again as if they had never been in contact with the disguised object. Consequently, the object is invisible to the observer.
The exotic optical properties of the camouflaging material are calculated using complex mathematical tools similar to Einstein’s theory of relativity.
For more details on the invisibility cloak, click here.