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Cloaking Achieved in Visible Spectrum

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KARLSRUHE, Germany, June 2, 2011 — The Karlsruhe invisibility cloak has been refined such that it is now effective in the visible spectral range. "Seeing something invisible with your own eyes is an exciting experience," say Joachim Fischer and Tolga Ergin, physicists and members of professor Martin Wegener's team at Karlsruhe Institute of Technology's Center for Functional Nanostructures (CFN). In invisibility cloaks, light waves are guided by the material such that they leave the invisibility cloak again as if they had never been in contact with the object to be disguised. Consequently, the object is invisible to...Read full article

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    Published: June 2011
    Glossary
    metamaterial
    Metamaterials are artificial materials engineered to have properties not found in naturally occurring substances. These materials are designed to manipulate electromagnetic waves in ways that are not possible with conventional materials. Metamaterials typically consist of structures or elements that are smaller than the wavelength of the waves they interact with. Key characteristics of metamaterials include: Negative refraction index: One of the most notable features of certain...
    nano
    An SI prefix meaning one billionth (10-9). Nano can also be used to indicate the study of atoms, molecules and other structures and particles on the nanometer scale. Nano-optics (also referred to as nanophotonics), for example, is the study of how light and light-matter interactions behave on the nanometer scale. See nanophotonics.
    visible spectrum
    That region of the electromagnetic spectrum to which the retina is sensitive and by which the eye sees. It extends from about 400 to 750 nm in wavelength.
    3-D invisibility cloakCenter for Functional NanostructuresCommunicationsdirect laser writing methodenergyEuropeGermanyinvisibility cloakJoachim FischerKarlsruhe Institute of TechnologyKITlensesMartin WegenermetamaterialMicroscopymirrorsnanononpolarized visible lightOpticsResearch & TechnologyTolga Erginvisible light spectrumvisible spectrum

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