Optical properties of plasmon resonance with Ag/SiO2/Ag multi-layer nanoparticles are studied by numerical simulation based on Green's function theory. The results show that compared with single-layer Ag nanoparticles, the multi-layer nanoparticles exhibit several distinctive optical properties, e.g. with increasing the numbers of the multi-layer nanoparticles, the scattering efficiency red shifts, and the intensity of scattering enhances accordingly. It is interesting to find out that slicing an Ag-layer into multi-layers leads to stronger scattering intensity and more ``hot spots'' or regions of stronger field enhancement. This property of plasmon resonance of surface Raman scattering has greatly broadened the application scope of Raman spectroscopy. The study of metal surface plasmon resonance characteristics is critical to the further understanding of surface enhanced Raman scattering as well as its applications.
Optical properties of plasmon resonance with Ag/SiO2/Ag multi-layer nanoparticles are studied by numerical simulation based on Green's function theory. The results show that compared with single-layer Ag nanoparticles, the multi-layer nanoparticles exhibit several distinctive optical properties, e.g. with increasing the numbers of the multi-layer nanoparticles, the scattering efficiency red shifts, and the intensity of scattering enhances accordingly. It is interesting to find out that slicing an Ag-layer into multi-layers leads to stronger scattering intensity and more ``hot spots'' or regions of stronger field enhancement. This property of plasmon resonance of surface Raman scattering has greatly broadened the application scope of Raman spectroscopy. The study of metal surface plasmon resonance characteristics is critical to the further understanding of surface enhanced Raman scattering as well as its applications.
[1] Nie S et al 1997 Science 275 1102 [2] Barnes L W et al 2003 Nature 424 824 [3] Shuford K L et al 2005 J. Chem. Phys. 123 114713 [4] Murray W A et al 2007 Adv. Mater. 19 3771 [5] Maier S A 2007 Plasmonics: Fundamentals and Application (Berlin: Springer) [6] Kreibig U and Vollmer M 1995 Optical Properties of Metal Clusters (Berlin: Springer) [7] Novotny L 2006 Principle of Nano-Optics (Cambridge: Cambridge University) [8] Brioude A et al 2005 J. Phys. Chem. B 109 23371 [9] Kelly K L et al 2003 J. Phys. Chem. B 107 668 [10] Kottmann J P et al 2001 Opt. Express 8 655 [11] Su K H et al 2006 Appl. Phys. Lett. 88 063118 [12] Wu D J et al 2008 J. Chem. Phys. 129 074711 [13] Hoflich K et al 2009 J. Chem. Phys. 131 164704 [14] Wang J Q et al 2009 Chin. Phys. Lett. 26 084208 [15] Ma Y W et al 2010 Chin. Phys. Lett. 27 024207 [16] Girard C et al 1995 Phys. Rev. B 52 2889 [17] Martin O J F et al 1995 Phys. Rev. Lett. 74 526 [18] Johnson P B et al 1972 Phys. Rev. B 12 4370 [19] Ma Y W et al 2008 Chin. Phys. Lett. 25 2473 [20] Ma Y W et al 2009 J. Appl. Phys. 105 103101
2010, Vol. 27 
