How could we ensure invisibility ? Mmm... I suppose that we have to either reflect or transmit the light through targeted object, haven't we? It is neither inexplicable nor far away. You won't want to believe your eyes in the near future. Visibility will have been applied and we will be unaware surely (How will we detect an invisible object?). Get the lowdown on metamaterials. Here is Andrea Alu who talks about metamaterials and invisibility: The materials are usually arranged in repeating patterns, at scales that are smaller than the wavelengths of the phenomena they influence. Metamaterials derive their properties not from the properties of the base materials, but from their newly designed structures. Their precise shape, geometry, size, orientation and arrangement gives them their smart properties capable of manipulating electromagnetic waves: by blocking, absorbing, enhancing, or bending waves, to achieve benefits that go beyond what is possible with conventional materials. Appropriately designed metamaterials can affect waves of electromagnetic radiation or sound in a manner not observed in bulk materials. Those that exhibit a negative index of refraction for particular wavelengths have attracted significant research. These materials are known as negative-index metamaterials. Metamaterial research is interdisciplinary and involves such fields as electrical engineering, electromagnetics, classical optics, solid state physics, microwave and antennae engineering, optoelectronics, material sciences, nanoscience and semiconductor engineering. For more theoric information, you should watch the lesson of John Pendry, Imperial College London, as below:
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