| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Theoretical Study of Local Surface Plasmon Resonances on a Dielectric-Ag Core-Shell Nanosphere Using the Discrete-Dipole Approximation Method |
| MA Ye-Wan**, WU Zhao-Wang, ZHANG Li-Hua, LIU Wan-Fang, ZHANG Jie |
School of Physics and Electric Engineering, Anqing Normal University, Anqing 246011
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| Cite this article: |
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MA Ye-Wan, WU Zhao-Wang, ZHANG Li-Hua et al 2015 Chin. Phys. Lett. 32 094202 |
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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.
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Received: 17 April 2015
Published: 02 October 2015
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| PACS: |
42.25.-p
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(Wave optics)
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42.25.Hz
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(Interference)
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42.62.-b
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(Laser applications)
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78.67.-n
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(Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)
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