Physical bounds on electromagnetic invisibility and the potential of superconducting cloaks |
| |
| Institution: | 1. Univ. Paris-Sud, Institut d’Electronique Fondamentale, UMR 8622, 91405 Orsay Cedex, France;2. CNRS, Orsay F-91405, France;3. Laboratoire Charles Fabry, IOGS, CNRS, Univ. Paris-Sud, 2 Ave A. Fresnel, 91127 Palaiseau Cedex, France;1. Institute of Electronic Structure and Laser, Foundation for Research and Technology, Hellas (FORTH), P.O. Box 1385, Heraklion, Crete, Greece;2. Department of Materials Science and Technology, University of Crete, Greece;3. Physics Department, University of Crete, Greece;4. Ames Lab and Department of Physics and Astronomy, Iowa State University, Ames, IA, USA;1. Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece;2. School of Electronic and Computer Engineering, Technical University of Crete, GR-73100 Chania, Greece |
| |
| Abstract: | The possibility of suppressing the scattering cross section of an object is subject to fundamental physical bounds imposed by causality and passivity. Global cloaking limitations have been recently derived, which imply that any linear, causal and passive cloak necessarily increases the global scattering, integrated over the whole electromagnetic spectrum, compared to the uncloaked object. Here, we expand on this topic, discussing in detail an interesting exception to this limit represented by cloaks with static diamagnetism. In this context, we explore the potential of superconducting materials to realize global and local reduction of the scattering cross section. The concepts of plasmonic and mantle cloaking are extended to superconductors, realizing strong and tunable invisibility, with some unique properties stemming from the peculiar electrodynamics of superconductors. We conclude by qualitatively discussing a possible method to derive more stringent local bounds on cloaking. |
| |
| Keywords: | Cloaking Superconductors Metamaterials |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
