Abstract
Metallic nanocomposite material is widely used in Surface Plasmon Rsesonance (SPR) due to its high stability and special optical features which enhance the Surface Enhanced Ramon Scattering (SERS) effect. A novel multi-layered Au-dielectric core-shell structural SERS substrate is proposed. Finite Elment Analysis (FEA) simulation shows multi-layer shell-core nanosphere (SiO2@Au, SiO2@Au@SiO2...) can improve Local Field Enhancement (LFE), comparing to Au single-layer nanosphere. That is because multi-layer nanoshpere exists intra-layer coupling besides cavity coupling. Moreover, red-shift can be observed via tuning the thickness of multi-layer nanospheres, which is greatly beneficial to biological detection in near infrared region (NIR). Lastly, these multi-layer nanospheres are synthesised by liquid phase reduction. And high absorbance and red-shift effect are verified with UV-vis absorption spectrum.
© 2011 Optical Society of America
PDF ArticleMore Like This
Chit Yaw Fu, U. S Dinish, Kiang Wei Kho, Douglas Goh Wenda, and Malini Olivo
80900B European Conference on Biomedical Optics (ECBO) 2011
Joseph Young and Rebekah Drezek
OTuD2 Optical Molecular Probes, Imaging and Drug Delivery (OMP) 2011
Yuan Zeng, Hai-jun Tan, Xiu-Lan Cheng, Rui Chen, and Ying Wang
83110H Asia Communications and Photonics Conference and Exhibition (ACP) 2011