Ten-Micrometer-Thick Si Wafers with Ag Nanoclusters: Substrate Effects on Plasmon-Enhanced Optical Absorption
Plasmonics, ISSN: 1557-1963, Vol: 12, Issue: 2, Page: 405-410
2017
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Article Description
We present the optical characteristics of 10-μm-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.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84973610881&origin=inward; http://dx.doi.org/10.1007/s11468-016-0278-2; http://link.springer.com/10.1007/s11468-016-0278-2; http://link.springer.com/content/pdf/10.1007/s11468-016-0278-2; http://link.springer.com/content/pdf/10.1007/s11468-016-0278-2.pdf; http://link.springer.com/article/10.1007/s11468-016-0278-2/fulltext.html; https://dx.doi.org/10.1007/s11468-016-0278-2; https://link.springer.com/article/10.1007/s11468-016-0278-2
Springer Nature
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