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

Sujung Kim; Yunae Cho; Ahrum Sohn; Dong Wook Kim

doi:10.1007/s11468-016-0278-2

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

Sujung Kim, Yunae Cho, Ahrum Sohn, Dong Wook Kim

Department of Physics

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	405-410
Number of pages	6
Journal	Plasmonics
Volume	12
Issue number	2
DOIs	https://doi.org/10.1007/s11468-016-0278-2
State	Published - 1 Apr 2017

Bibliographical note

Funding Information:
This work was supported by the Quantum Metamaterials Research Center through the National Research Foundation of Korea Grant (No. 2015001948) and New & Renewable Energy Technology Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) Grant (20123010010160).

Publisher Copyright:
© 2016, Springer Science+Business Media New York.

Keywords

Ag heptamer
Anti-reflection effect
Plasmonic nanoantennae
Silicon wafer

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

abstract = "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.",

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AU - Sohn, Ahrum

AU - Kim, Dong Wook

N1 - Funding Information: This work was supported by the Quantum Metamaterials Research Center through the National Research Foundation of Korea Grant (No. 2015001948) and New & Renewable Energy Technology Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) Grant (20123010010160). Publisher Copyright: © 2016, Springer Science+Business Media New York.

PY - 2017/4/1

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N2 - 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.

AB - 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.

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

Abstract

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Keywords

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