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

Asger Mortensen, Ole Sigmund, Olav Breinbjerg

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

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Resumé

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
OriginalsprogEngelsk
TidsskriftJournal of the European Optical Society - Rapid Publications
Vol/bind4
Sider (fra-til)5
ISSN1990-2573
DOI
StatusUdgivet - 2009
Udgivet eksterntJa

Fingeraftryk

slip
lenses
wavelengths
assemblies
porosity
polarization

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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 L{\"u}neburg 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 L{\"u}neburg-lens arrays perform in the opposite limit with L l",
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Prospects for poor-man's cloaking with low-contrast all-dielectric optical elements. / Mortensen, Asger; Sigmund, Ole; Breinbjerg, Olav.

I: Journal of the European Optical Society - Rapid Publications, Bind 4, 2009, s. 5.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Prospects for poor-man's cloaking with low-contrast all-dielectric optical elements

AU - Mortensen, Asger

AU - Sigmund, Ole

AU - Breinbjerg, Olav

PY - 2009

Y1 - 2009

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AB - 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

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