Journal article
Prospects for poor-man's cloaking with low-contrast all-dielectric optical elements
Structured Electromagnetic Materials, Department of Photonics Engineering, Technical University of Denmark1
Department of Photonics Engineering, Technical University of Denmark2
Solid Mechanics, Department of Mechanical Engineering, Technical University of Denmark3
Department of Mechanical Engineering, Technical University of Denmark4
Electromagnetic Systems, Department of Electrical Engineering, Technical University of Denmark5
Department of Electrical Engineering, Technical University of Denmark6
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 2p.
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.
L l with L being the period and l the free-space wavelength. Interestingly, cloaking-like operations with Lüneburg-lens arrays perform in the opposite limit with L l
Language: | English |
---|---|
Publisher: | European Optical Society |
Year: | 2009 |
ISSN: | 19902573 |
Types: | Journal article |
DOI: | 10.2971/jeos.2009.09008 |
ORCIDs: | Mortensen, Asger , Sigmund, Ole and Breinbjerg, Olav |