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Ellipsoidal Core–Shell Dielectric-Gold Nanostructure: Theoretical Study of the Tunable Surface Plasmon Resonance

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The dependence of surface plasmon resonance (SPR) characters of core–shell structure ellipsoidal nanorods was investigated as functions of the gold shell width and dielectric constant. A dipole-limit calculation indicated that, there are four SPR absorption peaks occur. The two shorter wavelength peaks are attributed to the transverse resonances, whereas the two longer wavelength peaks are attributed to the longitudinal resonances. Both transverse and longitudinal resonances are split into inner surface and outer surface modes, respectively. When the core size is a fixed value, the two transverse surface plasmon peaks red shift as the gold shell width is increased. On the other hand, both the inner and outer surface modes attributed to the longitudinal surface plasmon peaks blue shifts distinctly and nonlinearly. Further more, both the inner and outer surface plasmon modes are also dependent on the embedding medium and core dielectric constant. The longitudinal SPR from inner surface is more sensitive to the core dielectric constant, whereas the longitudinal SPR from outer surface is more sensitive to the surrounding medium.
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Document Type: Research Article

Publication date: 2007-03-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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