Study on the Characteristics of Dipole-excited Localized Surface Plasmon on a Metal Layer Surface
Date Issued
2008
Date
2008
Author(s)
Shen, Chung-Wei
Abstract
First, we study the emission characteristics of the dipole coupling system with a localized surface plasmon (LSP) based on the boundary-integral-equation method (BIEM). Then, we try to explain the emission phenomenon by evaluating the mode pattern, phase distribution, and dispersion curve. Also, we calculate the angle-dependent emission to confirm this result. Second, the simulation results of a dipole coupling system with surface plasmon (SP) induced on a metal/dielectric interface of a single groove (SG) plus a grating structure are demonstrated. With the SG structure, the dipole can effectively couple energy into an SP feature, which has a mixed nature of LSP and surface plasmon polariton (SPP). The SPP energy is confined by the grating structure with its period about one-half the period of the SPP propagating field distribution. With such a cavity configuration, the SPP energy can be well preserved. Both the dipole-SP coupling behaviors in the frequency and time domains are numerically illustrated. The results are useful for designing a metal/dielectric interface nanostructure for implementing an SPASER (surface plasmon amplification by stimulated emission of radiation)
Subjects
Surface Plasmon
Localized Surface Plasmon
Type
thesis
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