奈米金屬結構表面電漿特性之探討

奈米金屬結構表面電漿特性之探討，在主題一我們利用奈米銀柱與銀殼柱對陣列，並在銀殼柱內部填充介電材料研究其表面電漿模式的效應，其模擬結果顯示它很戲劇性的將近場光增強且侷限在間隙之中，我們所提出的結構對於表面電漿的元件以及生醫感測器上在將來的積體化是個受歡迎且有希望實現的一個方式，而這個現象是在奈米銀柱對在同樣的體積下所看不到的結果。在主題二中是使用奈米銀珠與銀殼珠陣列，並改變其奈米銀的殼厚大小、週期與埋入深度研究其表面電漿模式的效應，其模擬結果顯示它可以在太陽能基板上對光的吸收率有大幅增加，我們所提出的結構對於未來的表面電漿的太陽能電池是個穩定且容許工程上的誤差，也會有相同的效果。

關鍵字

有限元素法；表面電漿；奈米金屬結構；太陽能電池

並列摘要

We numerically investigated the surface plasmon resonances (SPRs) in a periodic array of solid-silver/silver-shell nanorod pair structures for sensing applications by employing a finite-element method. The proposed periodic array of silver-shell nanorod pair structure is composed of a pair of metallic nanorod with a dielectric hole (DH) that interact with a transverse magnetic mode incident plane wave, which includes the investigation of particle–particle interaction. We demonstrate that near-field coupling of the periodic array of solid-silver/silver-shell nanorod pair structures result in a periodic lattice of SPR modes with enhanced field intensities and transmittance dips. The influences of different illumination wavelengths, periods, transmittance spectra, energy flows and electric stream lines, DHs, electric field component distributions and total field intensities, charge density distribution, and the model of the induced local field of the periodic array of solid-silver/silver-shell nanorod pair on “bonding” modes are discussed in our simulations. The proposed structure exhibits a redshifted localized SPR that can be modified over an extended wavelength range of peak resonances and transmittance dips by varying the relative permittivities in DHs and the period of the periodic nanostructure. Simulation results show that the SPR modes are very sensitive to the relative permittivities change in the surrounding materials, which could be used as highly sensitive sensors.