Metamaterial as a controllable template for nanoscale field localization

Kao, T.S., Huang, F.M., Chen, Y., Rogers, E.T.F. and Zheludev, N.I. (2010) Metamaterial as a controllable template for nanoscale field localization. Applied Physics Letters, 96 (4), 041103-[3pp]. (doi:10.1063/1.3291675).

Abstract

We report that subwavelength localization of light in the near-field of a double-periodic photonic metamaterial may be efficiently controlled by the polarization and wavelength of the incident radiation. A dramatic variation in the periodic near-field landscapes, including a transition from a pattern of isolated subwavelength plasmon hot-spots to a blurred, low contrast pattern, accompanied by a change in the pattern's symmetry has been observed in the proximity of an aluminum nanowire "fish-scale" nanostructure. Hot-spots as small as 0.23 lambda have been achieved and their position has been controlled by tuning the wavelength of incident light across the dipole absorption resonance of the metamaterial. A simple switch of the polarization state can lead to a spatial period doubling in the landscape pattern.

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Contributors

Author: N.I. Zheludev

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