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Nano Lett. 2012 Jun 13;12(6):3308-14. doi: 10.1021/nl301478n. Epub 2012 May 31.

Nonlocal effects in the nanofocusing performance of plasmonic tips.

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  • 1Department of Physics, Imperial College London, London SW7 2AZ.


The nanofocusing performance of plasmonic tips is studied analytically and numerically. The effects of electron-electron interactions in the dielectric response of the metal are taken into account through the implementation of a nonlocal, spatially dispersive, hydrodynamic permittivity. We demonstrate that spatial dispersion only slightly modifies the device parameters which maximize its field enhancement capabilities. The interplay between nonlocality, tip bluntness, and surface roughness is explored. We show that, although spatial dispersion reduces the field enhancement taking place at the structure apex, it also diminishes the impact that geometric imperfections have on its performance.

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