28 September 2007 Diffraction and dispersion management in active nanostructured metamaterials
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We explore the perspectives offered by nanoplasmonic metamaterials for manipulation of optical signals at the nanoscale. It is shown that in contrast to conventional dielectric waveguides, plasmonic and anisotropy-based waveguides support a number of highly-confined optical modes even when the waveguide size is much smaller than the wavelength. The effective modal indices in these systems can be either positive or negative and are strongly affected by material composition and waveguide size, providing a mechanism for manipulating the phase velocity and diffraction limit at the nanoscale. In active metamaterials, the combined effect of waveguide- and material-induced dispersions leads to a versatile control over the group velocity which can be changed from negative to large or small (in comparison with the speed of light in vacuum) positive values by a relatively weak modulation of material properties. In the end, the active metamaterial provide a unique platform for independent manipulation of group and phase velocities of electromagnetic radiation in sub-diffraction areas.
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Viktor A. Podolskiy, Viktor A. Podolskiy, Alexander A. Govyadinov, Alexander A. Govyadinov, "Diffraction and dispersion management in active nanostructured metamaterials", Proc. SPIE 6638, Photonic Metamaterials, 66380Q (28 September 2007); doi: 10.1117/12.731640; https://doi.org/10.1117/12.731640

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