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系統識別號 U0026-1707201323351100
論文名稱(中文) 利用非對稱結構下的限制模態引發電磁感應透明性
論文名稱(英文) Electromagnetically Induced Transparency Effect in Asymmetric Structure by Using the Trapped Mode Resonance
校院名稱 成功大學
系所名稱(中) 光電科學與工程學系
系所名稱(英) Department of Photonics
學年度 101
學期 2
出版年 102
研究生(中文) 凃承志
研究生(英文) Chih-Cheng Tu
學號 l76001294
學位類別 碩士
語文別 中文
論文頁數 56頁
口試委員 口試委員-林俊宏
口試委員-朱淑君
口試委員-曾雪峰
口試委員-陳宣燁
指導教授-張世慧
中文關鍵字 超穎材料  EIT效應  trapped mode 
英文關鍵字 metamaterial  EIT effect  trapped mode 
學科別分類
中文摘要 本論文主要在探討如何利用不對稱性結構產生的"trapped mode "共振達到電磁感應透明性(electromagnetically-induced transparency)簡稱EIT。由於在不對稱性結構中感應反向電流的破壞性干涉,導致此時散射光(scattering)極小,進而出現異常的高穿透率。這種好像把光限制住在結構而散射不出去的模態就是我們所謂的"trapped mode";至於EIT是一種當光入射物體後,接著在物體上發生電磁感應,在穿透頻譜上形成一個左右為低穿透率,中間卻是高穿透率的透明窗戶圖形稱之。
首先為了瞭解EIT形成的物理機制,我們使用Finite-Difference Time-Domain(FDTD)模擬不對稱兩金屬條結構,並利用hybridization理論探討幾何因子對於EIT效應的影響。我們成功地驗證不對稱性兩金屬條結構產生trapped mode共振時會導致EIT效應。也藉由模擬環境折射率對穿透頻譜的影響,證實EIT效應對環境的敏感度。
最後我們利用不對稱性結構會產生"trapped mode "共振這種概念,設計出不對稱三條金屬條結構,成功地在穿透頻譜上製造出兩個EIT峰值。以上的研究和討論也為將來設計超穎材料(metamaterial)達到EIT效應,帶來新的觀點及研究的方向。
英文摘要 In this thesis, we study the trapped mode resonance in an asymmetric structure and yield the phenomenon so-called plasmonic analogue of electromagnetically induced transparency (EIT) in this asymmetric structure.
In order to realize the formation of EIT, we use the hybridization theory to understand the physical mechanism. After that, the EIT effect was examined by Finite-Difference Time-Domain (FDTD) method. By adjusting the structural geometry of an asymmetric double-bar structure, we verify that the trapped mode resonance can lead to EIT effect. A metamaterial sensor based on the refractive index variation of the surrounding material is also numerically demonstrated.
Finally, according to the concept which trapped mode resonance can lead to EIT effect, we design an asymmetric triple-bar structure. This structure shows two transparency windows in the transmission spectra. The results shown in this thesis could provide a new perspective on the design of metamaterials to achieve better electromagnetic induced transparency effect.
論文目次 第一章 導論 1
1-1 超穎材料簡介 1
1-2電磁感應透明性(EIT)簡介 3
第二章 有限時域差分法(FDTD) 5
2-1 FDFD基本概念 5
2-2 FDTD演算法 8
2-3 吸收邊界條件 13
2-4 Drude model 16
第三章 應用原理介紹 18
3-1光散射理論(light scattering theory) 18
3-2 Mie Theory 22
3-3 利用FDTD模擬散射理論 24
3-4 hybridization principles 27
3-5 Trapped mode 共振介紹 33
第四章 不對稱性結構模擬分析 38
4-1模擬分析不對稱兩金屬條之EIT現象 38
4-2 產生兩個EIT峰值之三金屬條結構模擬分析 48
4-3 總結 52
第五章 結論 53
5-1結論 53
5-2 未來展望 54
參考資料 55
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會STAM會訊第136期(2011)
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