Low-loss directional cloaks without superluminal velocity or magnetic response.
Data(s) |
01/11/2012
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Resumo |
The possibility of making an optically large (many wavelengths in diameter) object appear invisible has been a subject of many recent studies. Exact invisibility scenarios for large (relative to the wavelength) objects involve (meta)materials with superluminal phase velocity [refractive index (RI) less than unity] and/or magnetic response. We introduce a new approximation applicable to certain device geometries in the eikonal limit: piecewise-uniform scaling of the RI. This transformation preserves the ray trajectories but leads to a uniform phase delay. We show how to take advantage of phase delays to achieve a limited (directional and wavelength-dependent) form of invisibility that does not require loss-ridden (meta)materials with superluminal phase velocities. This work was supported through a Multidisciplinary University Research Initiative, sponsored by the U.S. Army Research Office (Grant No. W911NF-09-1-0539), and partially supported by the U.S. Navy through a subcontract with SwampWorks (Contract No. N00167- 11-P-0292). |
Formato |
4471 - 4473 |
Identificador |
http://www.ncbi.nlm.nih.gov/pubmed/23114333 244654 Opt Lett, 2012, 37 (21), pp. 4471 - 4473 http://hdl.handle.net/10161/7575 1539-4794 |
Idioma(s) |
ENG en_US |
Relação |
Opt Lett Optics Letters |
Tipo |
Journal Article |
Cobertura |
United States |