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偏心纳米壳的近场和远场光学响应

Near- and Far-Field Optical Response of Eccentric Nanoshells.

作者信息

Peña-Rodríguez Ovidio, Díaz-Núñez Pablo, Rodríguez-Iglesias Vladimir, Montaño-Priede Luis, Rivera Antonio, Pal Umapada

机构信息

Instituto de Fusión Nuclear, Universidad Politécnica de Madrid, C/ José Gutiérrez Abascal 2, E-28006, Madrid, Spain.

Universidad Autónoma del Carmen, C/ 56 No. 4 Esq. Avenida Concordia, 24180, Ciudad del Carmen, Campeche, Mexico.

出版信息

Nanoscale Res Lett. 2017 Dec;12(1):16. doi: 10.1186/s11671-016-1796-8. Epub 2017 Jan 5.

DOI:10.1186/s11671-016-1796-8
PMID:28058650
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5216003/
Abstract

We study the optical response of eccentric nanoshells (i.e., spherical nanoparticles with an eccentric spherical inclusion) in the near and the far field through finite-difference time-domain simulations. Plasmon hybridization theory is used to explain the obtained results. The eccentricity generates a far-field optical spectrum with various plasmon peaks. The number, position, and width of the peaks depend on the core offset. Near-field enhancements in the surroundings of these structures are significantly larger than those obtained for equivalent concentric nanoshells and, more importantly, they are almost independent of the illumination conditions. This opens up the door for using eccentric nanoshells in applications requiring intense near-field enhancements.

摘要

我们通过时域有限差分模拟研究了偏心纳米壳（即具有偏心球形内含物的球形纳米颗粒）在近场和远场中的光学响应。利用等离子体杂交理论来解释所得结果。偏心度产生了具有各种等离子体峰的远场光谱。这些峰的数量、位置和宽度取决于核心偏移。这些结构周围的近场增强明显大于等效同心纳米壳的近场增强，更重要的是，它们几乎与照明条件无关。这为在需要强烈近场增强的应用中使用偏心纳米壳打开了大门。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a47b/5216003/ae4409ca3bbb/11671_2016_1796_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a47b/5216003/9120a10867fc/11671_2016_1796_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a47b/5216003/63b5c0a1bf0a/11671_2016_1796_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a47b/5216003/d689bd602ceb/11671_2016_1796_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a47b/5216003/04dda5403a1d/11671_2016_1796_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a47b/5216003/ae4409ca3bbb/11671_2016_1796_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a47b/5216003/9120a10867fc/11671_2016_1796_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a47b/5216003/63b5c0a1bf0a/11671_2016_1796_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a47b/5216003/d689bd602ceb/11671_2016_1796_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a47b/5216003/04dda5403a1d/11671_2016_1796_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a47b/5216003/ae4409ca3bbb/11671_2016_1796_Fig5_HTML.jpg

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