Journal
NANO LETTERS
Volume 10, Issue 7, Pages 2480-2483Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl100943e
Keywords
Near-field optics; nanophotonics; metamaterials; negative refractive index
Categories
Funding
- Nederlandse organisatie voor Wetenschappelijk Onderzoek (NWO)
- Dutch Ministry of Economic affairs
- Deutsche Forschungsgemeinschaft (DFG)
- State of Baden-Wurttemberg through the DFG-Center for Functional Nanostructures (CFN)
- European Commission [213390]
- Bundesministerium fur Bildung und Forschung (BMBF)
- Helmholtz-Hochschul-Nachwuchsgruppe [VH-NG-232]
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With their potential for spectacular applications, like superlensing and cloaking, metamaterials are a powerful class of nanostructured materials All these applications rely on the metamaterials acting as a homogeneous material We investigate a negative index metamaterial with a phase-sensitive near-field microscope and measure the optical phase as a function of distance Close to the metamaterial we observe extremely large spatial phase variations within a single unit cell which vanish on a 200 nm length scale from the sample These deviations of a state-of-the-art metamaterial from a homogeneous medium can be important for nanoscale applications
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