Nonlocal Effects in the Nanofocusing Performance of Plasmonic Tips

作者：Wiener Aeneas; Fernandez Dominguez Antonio I; Horsfield Andrew P; Pendry John B; Maier Stefan A^*

来源：Nano Letters, 2012, 12(6): 3308-3314.

DOI：10.1021/nl301478n

• Surface plasmon polaritons
• nanofocusing
• nonlocal effects
• tip bluntness
• surface roughness

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.

• 出版日期2012-6