Negative-Index Metamaterials: Looking into the Unit Cell
- Autor: M. Burresi, D. Diessel, D. van Oosten, S. Linden, M. Wegener, and L. Kuipers
Nano Lett. 10, 2480 (2010)
- Datum: 2.6.2010
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.