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|Title:||Diameter-bandwidth product limitation of isolated-object cloaking|
|Source:||Hashemi, H., Qiu, C.-W., McCauley, A.P., Joannopoulos, J.D., Johnson, S.G. (2012-07-05). Diameter-bandwidth product limitation of isolated-object cloaking. Physical Review A - Atomic, Molecular, and Optical Physics 86 (1) : -. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevA.86.013804|
|Abstract:||We show that cloaking of isolated objects using transformation-based cloaks is subject to a diameter-bandwidth product limitation: as the size of the object increases, the bandwidth of good (small-cross-section) cloaking decreases inversely with the diameter, as a consequence of causality constraints even for perfect fabrication and materials with negligible absorption. This generalizes a previous result that perfect cloaking of isolated objects over a nonzero bandwidth violates causality. Furthermore, we demonstrate broader causality-based scaling limitations on any bandwidth-averaged cloaking cross section, using complex analysis and the optical theorem to transform the frequency-averaged problem into a single-scattering problem with transformed materials. © 2012 American Physical Society.|
|Source Title:||Physical Review A - Atomic, Molecular, and Optical Physics|
|Appears in Collections:||Staff Publications|
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