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

Title
Strong Light Confinement in Metal-Coated Si Nanopillars: Interplay of Plasmonic Effects and Geometric Resonance
Authors
Kim S.Kim E.Lee Y.U.Ko E.Park H.-H.Wu J.W.Kim D.-W.
Ewha Authors
우정원김동욱
SCOPUS Author ID
우정원scopus; 김동욱scopus
Issue Date
2017
Journal Title
Nanoscale Research Letters
ISSN
1931-7573JCR Link
Citation
vol. 12, no. 1
Keywords
Localized surface plasmonMie resonanceNanopillar arraySiSurface plasmon polariton
Publisher
Springer New York LLC
Indexed
SCOPUS WOS scopus
Abstract
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. © 2017, The Author(s).
DOI
10.1186/s11671-017-1932-0
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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