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題名 | 金奈米粒子和單根金奈米線的基板調節區域表面電漿共振=Substrate-Mediated Localized Surface Plasmon Resonance of Gold Nanoparticles and Single Gold Nanowire |
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作者 | 王俐雲; 林鶴南; | 書刊名 | 科儀新知 |
卷期 | 201 2014.12[民103.12] |
頁次 | 頁4-11 |
專輯 | 奈米科學與應用專題 |
分類號 | 440.34 |
關鍵詞 | 金奈米粒子; 單根金奈米線; 基板調節; 表面電漿共振; |
語文 | 中文(Chinese) |
中文摘要 | 近年來由於金屬奈米結構具有區域表面電漿共振的特性,表現出許多獨特和顯著的光學性質,並可應用於奈米光學元件、生物感測等研究領域,因此受到廣大的重視。當金屬奈米結構置於介電質基板時,會產生基板調節現象,改變原本的共振模態。本文藉由暗視野光學顯微術、分析金奈米粒子與奈米線在基板上的散射光譜,並以有限差分時域法,模擬金奈米結構受基板調節時的共振模態。圓球形的金奈米粒子於基板上,由於基板誘發模態耦合,可觀察到偶極和四極模態的共振波峰,但對單一金奈米線,則只有觀察到偶極模態耦合所產生的共振波峰。 |
英文摘要 | In recent years, metal nanostructures have attracted great research interests in a wide range of fields including nanophotonic devices, biosensors, etc. due to their remarkable optical properties related to localized surface plasmon resonance (LSPR). When metal nanostructures are located on a dielectric substrate, the strong substrate-mediated effect induces distinct shifts of LSPR peaks and modification of resonance modes. In this article, the substrate-mediated LSPR modes of gold nanoparticles and nanowires are investigated. The resonance spectra are obtained by dark-field optical microscopy and the resonance modes are analyzed by numerical simulations based on the finite-difference time-domain method. For a spherical gold nanoparticle on a dielectric substrate, the plasmon dipolar and quadrupolar modes can be observed due to the substrate-mediated coupling effect. For the single gold nanowire, only substrate-mediated dipolar coupling modes are observed. |
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