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研究生： 徐合儒
Hsu, Ho-Ju
論文名稱： 二維金屬棒電漿子結構的吸收與反交會現象
Avoided Resonance Crossing and Asymmetric Asorption in Plasmonic 2D Nanobars
指導教授： 張世慧
Chang, Shih-Hui
學位類別： 碩士
Master
系所名稱： 理學院 - 光電科學與工程學系
Department of Photonics
論文出版年： 2017
畢業學年度： 105
語文別： 中文
論文頁數： 53
中文關鍵詞： 有限時域差分 、表面電漿子 、反交會現象 、頻率選擇表面
外文關鍵詞： FDTD, Surface plasmons, Avoided resonance crossing, frequency selective surface
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    • 本篇論文以數值方法展示了在二維波導結構中，電漿子奈米金屬棒在遠場耦合時之反交會現象(Avoided resonance crossings,ARC)。由相似的奈米金屬棒所產生的強烈吸收與光捕獲可以藉由Frequency-Selective-Surface-Fabry-Perot model來解釋。此外，使之位移的奈米金屬棒也可以達到類似的現象。在左右不同方向入射時，因為結構對稱性的破壞也導致能量的交會及線寬的分裂，進而有反交會的產生。除了在PEC波導結構，於週期性結構下也能產生相同的結果。最後，我們介紹一種名為contstant k的方法來改善相同奈米金屬棒的位移下的結果。

    Avoided resonance crossing phenomena were demonstrated in asymmetry nanobars obstacles placed in 2D waveguide structure. Observed asymmetric absorption and light trapping were explained by frequency-selective-surface (FSS)–Fabry-Perot (FP) model. Besides, shifted bars in PEC waveguide also exhibit similar phenomena. We observe linewidth anti-crossing but energy crossing of the absorption peak from different side illumination by varying the gap in bar arrays. On the other hands, we also simulate the bars by using period structure to obtain the same result. In the end, we introduce a new oblique angle approach, which is constant k method, to improve the result in shifted identical bars.

    口試合格證明.........................................................I 中文摘要............................................................II Abstract............................................................III 誌謝................................................................IX 目錄.................................................................X 圖目錄.............................................................XII 第一章 緒論..........................................................1 1.1 研究動機與本文內容.........................................1 第二章 相關理論簡介..................................................4 2.1 金屬表面電漿子.............................................4 2.2 頻率選擇表面...............................................7 第三章 數值方法......................................................9 3.1 有限差分時域法(FDTD)簡介...................................9 3.2 吸收邊界層................................................13 3.3 模擬空間設置..............................................14 第四章 模擬結果之分析與討論.........................................16 4.1 Avoided Resonance Crossing與雙振子系統...................16 4.2 在PEC環境下的分析........................................18 4.2.1 Grating effect......................................19 4.2.2 Fabry Perot.........................................22 4.2.3 Asymmetric absorption...............................26 4.2.4 Shifted identical bar...............................32 4.3 在週期環境下的分析........................................35 4.3.1 Grating effect......................................35 4.3.2 Fabry Perot.........................................39 4.3.3 Asymmetric absoption................................42 4.3.4 Shifted identical bar...............................44 4.3.5 FSS-FP model........................................47 第五章 結論與未來展望...............................................50 5.1 結論.......................................................50 5.2 未來展望...................................................50 參考文獻.............................................................52

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