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Ten-Micrometer-Thick Si Wafers with Ag Nanoclusters: Substrate Effects on Plasmon-Enhanced Optical Absorption

Title
Ten-Micrometer-Thick Si Wafers with Ag Nanoclusters: Substrate Effects on Plasmon-Enhanced Optical Absorption
Authors
Kim, SujungCho, YunaeSohn, AhrumKim, Dong-Wook
Ewha Authors
김동욱
SCOPUS Author ID
김동욱scopus
Issue Date
2017
Journal Title
PLASMONICS
ISSN
1557-1955JCR Link1557-1963JCR Link
Citation
vol. 12, no. 2, pp. 405 - 410
Keywords
Silicon waferAg heptamerAnti-reflection effectPlasmonic nanoantennae
Publisher
SPRINGER
Indexed
SCIE; SCOPUS WOS scopus
Abstract
We present the optical characteristics of 10-mu m-thick crystalline Si wafers with an Ag heptamer nanocluster (NC) array, using a finite-difference time-domain method. The anti-reflection properties of the Ag NC array were more pronounced at long wavelengths, with respect to a monomer array, resulting in significantly enhanced optical absorption in the underlying Si wafer. The scattering cross-section spectra of the NC on the Si wafer exhibited one broad peak with a kink, whereas those in air showed two broad peaks and a sharp Fano dip between them. The high refractive index Si wafer weakened the near-field coupling between particles in the NCs, which modified the optical cross-sections of the Ag NC more drastically than those of the Ag monomer. Therefore, the implementation of the NC nanoantennae for Si-based optoelectronic devices requires careful consideration of the substrate effects.
DOI
10.1007/s11468-016-0278-2
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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