A diameter--bandwidth product limitation of isolated-object cloaking

Autor:	Hashemi, Hila, Qiu, Cheng Wei, McCauley, Alexander P., Joannopoulos, J. D., Johnson, Steven G.
Rok vydání:	2012
Předmět:	Physics - Optics Physics - Popular Physics
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevA.86.013804
Popis:	We show that cloaking of isolated objects 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. Comment: 8 pages, 2 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1203.2190 Zobrazit plný text záznamu View this record from Arxiv