Journal
JOURNAL OF OPTICS
Volume 13, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2040-8978/13/2/024003
Keywords
electromagnetic cloaking; metamaterials; electromagnetic modulation; spacetime; observers and events
Categories
Funding
- EPSRC [EP/E031463/1]
- Leverhulme Embedding Emerging Disciplines award
- Engineering and Physical Sciences Research Council [EP/E031463/1, EP/E031684/1] Funding Source: researchfish
- EPSRC [EP/E031463/1, EP/E031684/1] Funding Source: UKRI
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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.
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