Ten-Micrometer-Thick Si Wafers with Ag Nanoclusters: Substrate Effects on Plasmon-Enhanced Optical Absorption
- 주제(키워드) Ag heptamer , Anti-reflection effect , Plasmonic nanoantennae , Silicon wafer
- 등재 SCIE, SCOPUS
- 발행기관 Springer New York LLC
- 발행년도 2016
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000135028
- 본문언어 영어
- Published As http://dx.doi.org/10.1007/s11468-016-0278-2
- 저작권 이화여자대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
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. © 2016 Springer Science+Business Media New York
more