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The Science Behind Invisibility
- Posted at 10:21 AM on May. 6, 2009 by ausetute Berkeley Scientists have created an invisibility cloak out of nanostructured silicon which conceals the presence of objects placed under it. While the cloak itself can be seen, the bulge of the object underneath it disappears from view. Previous attempts at an invisibility cloak using metallic metamaterials have succeeded in achieving invisibility cloaking at microwave frequencies. The new invisibility cloak, made out of dielectric materials which are often transparent at optical frequencies achieves invisibility for light between 1,400 and 1,800 nanometers in wavelength (the near-infrared part of the electromagnetic spectrum). Researchers are now confident that a dielectric approach to invisibility could lead to a material that operates for visible light. Valentine et al. An optical cloak made of dielectrics. Nature Materials, 2009; DOI: 10.1038/nmat2461 Post Comment
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