Studies on the Fundamental Properties and Applications of Surface Plasmon Coupling with a Dipole in a Metal Surface Nano-Grating Structure

• Main Authors: Wen-Hung Chuang, 莊文宏
• Other Authors: Yean-Woei Kiang
• Format: Others
• Language: en_US
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/23115166816914586459

碩士 === 國立臺灣大學 === 光電工程學研究所 === 96 === 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. Finally, 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.