Issue |
J. Eur. Opt. Soc.-Rapid Publ.
Volume 4, 2009
|
|
---|---|---|
Article Number | 09008 | |
Number of page(s) | 5 | |
DOI | https://doi.org/10.2971/jeos.2009.09008 | |
Published online | 04 March 2009 |
Regular papers
Prospects for poor-man’s cloaking with low-contrast all-dielectric optical elements
1
Department of Photonics Engineering, Technical University of Denmark, DTU Fotonik, DTU-building 345 west, DK-2800 Kongens Lyngby, Denmark
2
Department of Mechanical Engineering, Technical University of Denmark, Nils Koppels Allé, Building 403, DK-2800 Kongens Lyngby, Denmark
3
Department of Electrical Engineering, Technical University of Denmark, Building 348, DK-2800 Kongens Lyngby, Denmark
Received:
14
November
2008
We discuss the prospects for low-contrast all-dielectric cloaking and offer a simple picture illustrating the basic obstacle for perfect cloaking without materials with an effective double-negative response. However, the same simple picture also gives directions for less perfect designs allowing for planar transmitted fields, but at the price of phase-slips which can only be eliminated at well-defined frequencies where the phase-slip amounts to a multiple of 2π. As a particular example, we consider assemblies of all-dielectric Lüneburg lenses forming a porous structure allowing for hiding objects inside the pores, independently on the polarization of the incident field. Cloaking must in general be realized with metamaterials realized through sub-wavelength structures, i.e. Λ ≪ λ with Λ being the period and λ the free-space wavelength. Interestingly, cloaking-like operations with Lüneburg-lens arrays perform in the opposite limit with Λ ≫ λ.
Key words: Lüneburg lens / cloaking
© The Author(s) 2009. All rights reserved.
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