Sub-wavelength focusing meta-lens

We show that a planar plasmonic metamaterial with spatially variable meta-atom parameters can focus transmitted light into sub-wavelength hot-spots located beyond the near-field of the metamaterial. By nano-structuring a gold film we created an array of meta-lenses generating foci of 160 nm (0.2λ) i...

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Bibliographic Details
Published inOptics express Vol. 21; no. 6; pp. 7577 - 7582
Main Authors Roy, Tapashree, Rogers, Edward T F, Zheludev, Nikolay I
Format Journal Article
LanguageEnglish
Published United States 25.03.2013
Subjects
Equipment Design
Equipment Failure Analysis
Gold - chemistry
Lenses
Membranes, Artificial
Metal Nanoparticles - chemistry
Metal Nanoparticles - ultrastructure
Surface Plasmon Resonance - instrumentation
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Summary:We show that a planar plasmonic metamaterial with spatially variable meta-atom parameters can focus transmitted light into sub-wavelength hot-spots located beyond the near-field of the metamaterial. By nano-structuring a gold film we created an array of meta-lenses generating foci of 160 nm (0.2λ) in diameter when illuminated by a wavelength of 800 nm. We attribute the occurrence of sub-wavelength hotspots beyond the near field to the phenomenon of superoscillation.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.21.007577