本論文中,我們以數值模擬的方法,以有限元素法探討單排與雙排奈米銀殼柱對之表面電漿效應,我們針對不同數目的奈米銀柱對、波長範圍與奈米銀殼柱內所填充之介電材料進行分析,模擬結果顯示當雙排奈米銀殼柱對之數目由三對增加至六對時會有藍移現象產生,當雙排奈米銀殼柱對之內所填充之介電常數增加時會有紅移現象產生。其中type 1結構可以調控較強的侷域表面電漿場增強與紅移現象,本論文的模擬可以經由簡單的數值模型,也就是三對、四對、五對雙排奈米銀殼柱對,便可定性的描述表面電漿效應在這些結構的作用機制。
In this thesis, we numerically studied the mechanisms and characteristics of the surface plasmon of a system consisting of single array and double pair arrays of silver-shell nanocylinders. Effects from different numbers of pair arrays, illumination wavelengths, and the core refractive index of silver-shell nanocylinders are studied by using the finite-element method. Results show that the peak wavelengths shift to shorter wavelengths (blue shifted) when the number of pair arrays increases from three to six, and shift to longer wavelengths when the refractive indices filled inside the silver-shell nanocylinders increases (red shifted). The near-field intensities in the gaps of the proposed type 1 structure can be tuned much stronger with a redshift by varying the wavelength of the incident light. The main features and mechanisms of surface plasmon effects can be qualitatively understood from some simple models of three to six pairs of silver-shell nanocylinders.