Synthesis of Metallic Nanostructures with Surface-Plasmonesonance at Designated Wavelengths
Date Issued
2009
Date
2009
Author(s)
Yang, Liang-Yu Ou
Abstract
The simulated annealing and the boundary integral-equation methods are used to synthesize metallic nanostructures with surface-plasmon resonance properties at designated wavelengths. The numerical results include three parts according to the possible applications: blue-light LEDs (wavelength 435 nm), white-light LEDs (wavelengths 450 nm and 570 nm), and green-light LEDs (wavelength 535 nm). For the blue-light LEDs, the structure consists of two metallic circular cylinders partially embedded in a metallic half-space. We first synthesize a metallic nanostructure such that the surface plasmon polariton (SPP) and the localized surface plasmon (LSP) couple effectively at their common resonant wavelength (435 nm). Next, we synthesize another structure for optimization at wavelength 520 nm, at which only the LSP resonance occurs. From numerical simulations, it is demonstrated that the enhancement of the dipole emission is better for optimization at wavelength 435 nm than that at wavelength 520 nm. In the aspect of white-light LEDs, the structure is composed of two separate metallic circular cylinders and a metallic half-space. We synthesize a metallic nanostructure, which has LSP resonances at wavelength 450 nm (blue light) and at wavelength 570 nm (yellow light), leading to the enhancement of white-light emission. For the green-light LEDs, the structure consists of two separate metallic elliptical cylinders and a metallic half-space. We synthesize a metallic nanostructure such that the SPP and LSP couple effectively at their common resonant wavelength (535 nm), leading to the enhancement of both the dipole emission and the emission efficiency.
Subjects
Surface-Plasmon Resonance
Type
thesis
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