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ABSTRACT: Plasmon hybridization theory (PHT) is an analytical model developed for understanding plasmonic interactions within complex metallic nanostructures, and gives a useful insight for optimizing design parameters. However, this theory is based on the electrostatic limit, which restricts the model to nanostructures much smaller than the free space wavelength of light. Here, we extend the PHT to incorporate retardation of the Coulomb interaction and investigate the effects of retardation on plasmons within metallic structures. We compare these results using other methods, such as Mie scattering theory and the finite integration technique, and observe a good agreement in both electrostatic and retardation regimes. Plasmons within metallic nanospheres and nanotubes are shown to have significant retardation in certain regimes, causing red-shifting to plasmon wavelengths, and we discuss the implications of retardation for plasmonic devices.
New Journal of Physics 08/2010; 12(8):083062. · 4.18 Impact Factor
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ABSTRACT: We present a detailed theoretical analysis which reveals a useful insight to understand the resonant dissipative behavior of 3D woodpile metallic photonic crystals in the spectral response. We observe that a small amount of structural parameter modifications can induce great flexibility to alter the properties of the absorption resonance with even an extremely narrow band width of ~13 nm. Analyzing the dispersive properties of the 3D woodpile metallic photonic crystals and performing thorough numerical simulations for the finite number of layers we found that the magnitude, band width, and tunability of enhanced absorption can be easily optimized, which can be of significance to design an efficient photonic crystal thermal emitter.
Optics Express 04/2010; 18(9):9048-54. · 3.59 Impact Factor
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ABSTRACT: A metallic-nanoshelled rectangular dielectric rod is proposed to flexibly enhance and tune the structural absorption. Due to the ultra-small thickness of the metallic-nanoshells, electromagnetic (EM) waves can penetrate into the rods and rectangular cavity resonances can be formed. At the cavity resonances, the strong EM wave–matter interaction results in an enhancement in the structural absorption by more than one order of magnitude. By stacking the nanoshelled rods, a three-dimensional (3D) woodpile photonic crystal with both the rectangular cavity resonance and the photonic band gap effect is realized. As a result, the structural absorption of the nanoshelled 3D photonic crystal is significantly enhanced to ~99.99% at the resonant wavelength.
New Journal of Physics 03/2010; 12(4):043012. · 4.18 Impact Factor
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ABSTRACT: Localized plasmon resonances are proposed in a new concept of 3D photonic crystals stacked by hybrid rods made of dielectric-cores and metallic-nanoshells. The resonant plasmon coupling of inner and outer surfaces of the metallic-nanoshells forms the localized plasmon resonances which can be flexibly tuned by mediating the dielectric cores. At the resonance wavelengths, the strong electromagnetic wave-plasmon interaction leads to the enhancement in the structural absorption by more than 20 times. The tunability of the enhanced absorption is demonstrated in experiments.
Optics Express 03/2010; 18(5):4491-8. · 3.59 Impact Factor
