Strong Light Confinement in Metal-Coated Si Nanopillars: Interplay of Plasmonic Effects and Geometric Resonance

被引：0

作者：

Sujung Kim

Eunah Kim

Yeon Ui Lee

Eunkyo Ko

Hyeong-Ho Park

Jeong Weon Wu

Dong-Wook Kim

机构：

[1] Ewha Womans University,Department of Physics

[2] Ewha Womans University,Department of Chemistry and Nano Science

[3] Korea Advanced Nano Fab Center (KANC),Device Platforms Lab., Device Engineering Labs.

来源：

Nanoscale Research Letters | 2017年 / 12卷

关键词：

Si; Nanopillar array; Localized surface plasmon; Surface plasmon polariton; Mie resonance; 88.40.H-; 88.40.jp; 81.07.Gf;

D O I：

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学科分类号：

摘要：

We investigated the influence of metal coating on the optical characteristics of Si nanopillar (NP) arrays with and without thin metal layers coated on the sample surface. The reflection dips of the metal-coated arrays were much broader and more pronounced than those of the bare arrays. The coated metal layers consisted of two parts—the metal disks on the Si NP top and the holey metal backreflectors on the Si substrate. The Mie-like geometrical resonance in the NPs, the localized surface plasmons in the metal disks, and the propagation of surface plasmon polariton along the backreflector/substrate interface could contribute to the reflection spectra. Finite-difference time-domain simulation results showed that the interplay of the plasmonic effects and the geometric resonance gave rise to significantly enhanced light confinement and consequent local absorption in the metal-Si hybrid nanostructures.

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