Metamaterial as a controllable template for nanoscale field localization

Kao, T. S.; Huang, F. M.; Chen, Y.; Rogers, E. T. F.; Zheludev, N. I.
January 2010
Applied Physics Letters;1/25/2010, Vol. 96 Issue 4, p041103
Academic Journal
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 0.23λ 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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