Prospects for poor-man's cloaking with low-contrast all-dielectric optical elements

Asger Mortensen, Ole Sigmund, Olav Breinbjerg

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Abstract

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
Original languageEnglish
JournalJournal of the European Optical Society - Rapid Publications
Volume4
Pages (from-to)5
ISSN1990-2573
DOIs
Publication statusPublished - 2009

Keywords

  • Lüneburg lens
  • Cloaking

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