TY - JOUR
T1 - Ten-Micrometer-Thick Si Wafers with Ag Nanoclusters
T2 - Substrate Effects on Plasmon-Enhanced Optical Absorption
AU - Kim, Sujung
AU - Cho, Yunae
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
Y1 - 2017/4/1
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.
KW - Ag heptamer
KW - Anti-reflection effect
KW - Plasmonic nanoantennae
KW - Silicon wafer
UR - http://www.scopus.com/inward/record.url?scp=84973610881&partnerID=8YFLogxK
U2 - 10.1007/s11468-016-0278-2
DO - 10.1007/s11468-016-0278-2
M3 - Article
AN - SCOPUS:84973610881
VL - 12
SP - 405
EP - 410
JO - Plasmonics
JF - Plasmonics
SN - 1557-1955
IS - 2
ER -