Abstract
This paper presents calculations of Raman enhancement for stratified concentric silicon-silver nanocylinders. The Raman enhancement factors of double-layer and triple-layer structures have been determined. Calculations have been performed for the following two-layer cylinders: Ag/Si(core), hollow silicon tube, and Si/Ag(core), and the following three-layer cylinders: Ag/Si/Ag(core), Si/Ag/Si(core), Si/vacuum/Ag(core), Si/vacuum/Si(core), and Si/Ag/vacuum(core). The results indicate that strong Raman enhancements can be obtained in stratified concentric silicon-silver nanocylinders in suitable conditions. These enhancements are sensitive to the excitation wavelength, the radius of the central material, the layer number, and the thickness of each layer of the stratified concentric silicon-silver nanocylinders. They are mainly attributed to the resonant excitations of the silicon cylinder, the resonant excitations of the silicon shell, the localized surface plasmon resonant excitations of silver, and the mirror effect of silver or silicon. The strongest Raman enhancement is about 1013 in two-layer and 1020 in three-layer concentric silicon-silver nanocylinders. The results indicate that the large Raman enhancement appears when the thin silicon layer is close to the silver.
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