A spacetime cloak, or a history editor
McCall, MW, Favaro, A, Kinsler, P and Boardman, AD 2010, 'A spacetime cloak, or a history editor' , Journal of Optics, 13 (2) , 024003.
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We introduce a new type of electromagnetic cloak, the spacetime cloak (STC), which conceals events rather than objects. Non-emitting events occurring during a restricted period are never suspected by a distant observer. The cloak works by locally manipulating the speed of light of an initially uniform light distribution, whilst the light rays themselves always follow straight paths. Any ‘perfect’ spacetime cloak would necessarily rely upon the technology of electromagnetic metamaterials, which has already been shown to be capable of deforming light in ways hitherto unforeseen—to produce, for example, an electromagnetic object cloak. Nevertheless, we show how it is possible to use intensity-dependent refractive indices to construct an approximate STC, an implementation that would enable the distinct signature of successful event cloaking to be observed. Potential demonstrations include systems that apparently violate quantum statistics, ‘interrupt-without-interrupt’ computation on convergent data channels and the illusion of a Star Trek transporter.
|Themes:||Subjects outside of the University Themes|
|Schools:||Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering > Materials & Physics Research Centre|
|Journal or Publication Title:||Journal of Optics|
|Publisher:||European Optical Society|
|Depositing User:||Users 29196 not found.|
|Date Deposited:||18 Jul 2012 10:08|
|Last Modified:||18 Jul 2012 10:08|
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