Abstract：The local surface plasmon resonances (LSPRs) of dielectric-Ag core-shell nanospheres are studied by the discrete-dipole approximation method. The result shows that LSPRs are sensitive to the surrounding medium refractive index, which shows a clear red-shift with the increasing surrounding medium refractive index. A dielectric-Ag core-shell nanosphere exhibits a strong coupling between the core and shell plasmon resonance modes. LSPRs depend on the shell thickness and the composition of dielectric-core and metal-shell. LSPRs can be tuned over a longer wavelength range by changing the ratio of core to shell value. The lower energy mode ω? shows a red-shift with the increasing dielectric-core value and the inner core radius, while blue-shifted with the increasing outer shell thickness. The underlying mechanisms are analyzed with the plasmon hybridization theory and the phase retardation effect.
(Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)
引用本文:
. [J]. 中国物理快报, 2015, 32(09): 94202-094202.
MA Ye-Wan, WU Zhao-Wang, ZHANG Li-Hua, LIU Wan-Fang, ZHANG Jie. Theoretical Study of Local Surface Plasmon Resonances on a Dielectric-Ag Core-Shell Nanosphere Using the Discrete-Dipole Approximation Method. Chin. Phys. Lett., 2015, 32(09): 94202-094202.
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