Studies on the Fundamental Properties and Applications of Surface Plasmon Coupling with a Dipole in a Metal Surface Nano-Grating Structure
Date Issued
2008
Date
2008
Author(s)
Chuang, Wen-Hung
Abstract
In this thesis, we demonstrate the differentiation between the contributions of localized surface plasmon (LSP) and surface plasmon polariton (SPP) couplings with an emitting dipole to emission enhancement in a metallic grating structure using the boundary integral-equation method (BIEM). Because the LSP resonance energy is sensitive to the metal/dielectric interface geometry, it may be difficult to control the enhancement for a desired emission wavelength based on the LSP coupling. On the other hand, because the SPP feature can be controlled by the period of a grating structure, the implementation of the SPP coupling for emission enhancement in a practical device can be more feasible.To further understand the coupling process, the transient behaviors of the dipole couplings with a grating-perturbed resonant SPP, an LSP, a grating-assisted SPP, and a flat-interface resonant SPP feature are numerically studied. The system decays of all the four SP coupling features include three major mechanisms: metal dissipation, bottom emission, and energy outward transport along the metal/dielectric interface. inally, we numerically study the enhancements of internal quantum efficiency (IQE) and quasi-external quantum efficiency (QEQE) of a radiation dipole coupled with surface plasmons. In applying the SP coupling phenomenon to an InGaN/GaN quantum-well light-emitting diode, the efficiency enhancement is more significant in the green-red range, in which the intrinsic IQE is normally quite low.
Subjects
surface plasmon
Type
thesis
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