Nonlocal Effects in the Nanofocusing Performance of Plasmonic Tips
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- 作者：Aeneas Wiener ; Antonio I. Fern谩ndez-Dom铆nguez ; Andrew P. Horsfield ; John B. Pendry ; Stefan A. Maier
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：June 13, 2012
- 年：2012
- 卷：12
- 期：6
- 页码：3308-3314
- 全文大小：442K
- 年卷期：v.12,no.6(June 13, 2012)
- ISSN：1530-6992
文摘
The nanofocusing performance of plasmonic tips is studied analytically and numerically. The effects of electron鈥揺lectron 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.