Asymmetric light reflectance from metal nanoparticle arrays on dielectric surfaces

Asymmetric light reflectance associated with localized surface plasmons excited in metal nanoparticles on a quartz substrate is observed and analyzed. This phenomenon is explained by the superposition of two waves, the wave reflected by the air/quartz interface and that reflected by the metal nanopa...

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Bibliographic Details
Published inScientific reports Vol. 5; no. 1; p. 18331
Main Authors Huang, K., Pan, W., Zhu, J. F., Li, J. C., Gao, N., Liu, C., Ji, L., Yu, E. T., Kang, J.Y.
Format Journal Article
LanguageEnglish
Published London Nature Publishing Group UK 18.12.2015
Nature Publishing Group
Subjects
639/624/400/1021
639/638/542/969
Gold
Humanities and Social Sciences
Metals
multidisciplinary
Nanoparticles
Quartz
Raman spectroscopy
Reflectance
Science
Spectroscopy
Substrates
Thin films
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Summary:Asymmetric light reflectance associated with localized surface plasmons excited in metal nanoparticles on a quartz substrate is observed and analyzed. This phenomenon is explained by the superposition of two waves, the wave reflected by the air/quartz interface and that reflected by the metal nanoparticles and the resulting interference effects. Far field behavior investigation suggests that zero reflection can be achieved by optimizing the density of metal nanoparticles. Near field behavior investigation suggests that the coupling efficiency of localized surface plasmon can be additionally enhanced by separating the metal NPs from substrates using a thin film with refractive index smaller than the substrate. The latter behavior is confirmed via surface-enhanced Raman spectroscopy studies using metal nanoparticles on Si/SiO2 substrates.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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ISSN:2045-2322
2045-2322
DOI:10.1038/srep18331