有機分子微共振腔光子與激子強耦合之研究

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姓名

鄭慶偉(Ching-wei Cheng) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

有機分子微共振腔光子與激子強耦合之研究
(Research on polariton in strongly coupled organic semiconductor microcavities)

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摘要(中)

本篇論文主要研究以DEDOC花青染料分子製作具有J-aggregate分子排列結構之高吸收薄膜，找出最理想的製程方式，使其具有最佳的吸收與發光特性。並觀察將DEDOC J-aggregate薄膜置入微共振腔內形成光子與激子強耦合的現象。
在製備DEDOC J-aggregate薄膜上，我們嘗試了layer-by-layer assembly與旋轉塗佈的方式，並對其光學性質與薄膜物理結構進行分析與探討。發現以layer-by-layer assembly製作之J-aggregate薄膜，結構的緻密性與均勻性較佳，因此在峰值吸收係數與發光均勻性上，比旋轉塗佈的J-aggregate薄膜好。根據薄膜製備分析的結論，我們將優化的DEDOC薄膜置入金屬-介電質反射鏡共振腔中，利用多角度反射頻譜與多角度光激螢光頻譜的量測，在室溫下觀測到polariton的能態，即光子與激子強耦合的發生。我們並比較量測結果與理論的二階模型，驗證polariton能態的產生。

摘要(英)

We present a method to fabricate high-absorption thin films composed of DEDOC cyanine dyes, a type of J-aggregates, that will yield the most favorable absorption and emission properties. By placing the thin films in a microcavity, the photon-exciton strong-coupling phenomenon is able to be observed.
The physical structures and optical properties of the J-aggregate thin films fabricated via both layer-by-layer assembly and spin coating are analyzed. We find that the layer-by-layer assembly method produces the most ideal absorption and uniform emissions when compared to the spin coating method, due to the structure and densification of the thin films. Based on the fabrication results, the modifying DEDOC thin films are placed in a metal-dielectric mirror microcavity, and measured by both angle-resolved reflection spectrum and angle-resolved photoluminescence spectrum to observe the polariton states at room temperature. Lastly, the reflection and emission measurements are compared with the two level model prediction as evidence for the polariton existence.

關鍵字(中)

★ 光子與激子強耦合
★ 微共振腔

關鍵字(英)

★ polariton
★ microcavities

論文目次

目錄
摘要 iv
Abstract v
誌謝 vi
第一章緒論 1
1-1 研究背景 1
1-2 有機材料與光強耦合研究發展 5
1-3 研究動機 8
第二章基礎原理 9
2-1 微共振腔的共振模態與色散關係 9
2-2 微共振腔內光與激子強耦合 11
2-3 薄膜理論 14
2-3-1 垂直入射之光學導納定義 14
2-3-2 單介面之反射與穿透 17
2-3-3 單層膜之反射與穿透 18
2-3-4 多層膜之反射與穿透 21
2-3-5 斜向入射之修正 22
2-4 Kramers-Kronig Relation 23
2-5 J-aggregate染料分子 25
2-6 Layer By Layer Assembly 29
第三章實驗架構 31
3-1 實驗儀器 31
3-1-1 雙電子槍蒸鍍系統 31
3-1-2 旋轉塗佈機 32
3-2 量測儀器 33
3-2-1 紫外光/可見光光譜儀 33
3-2-2 橢偏儀 33
3-2-3 原子力顯微鏡 35
第四章 DEDOC高吸收薄膜特性與製備 36
4-1 DEDOC高吸收薄膜layer-by-layer assembly製備 36
4-2 layer-by-layer assembly之DEDOC薄膜光學特性 40
4-3 layer-by-layer assembly之DEDOC薄膜物理特性 43
4-4 layer-by-layer assembly之DEDOC薄膜光電特性影響 45
4-5 DEDOC高吸收薄膜spin coating 製備 48
4-6 Spin coating之DEDOC薄膜光學特性 50
4-7 Spin coating之DEDOC薄膜物理特性 53
4-8 不同DEDOC薄膜製程之薄膜光激螢光影像 55
第五章微共振腔內光子與激子強耦合現象 57
5-1 Polariton微共振腔設計與製作 57
5-2 Polariton微共振腔變角度反射量測與分析 61
5-3 Polariton微共振腔光致發光量測 66
第六章結論與未來工作 72
文獻參考 74

參考文獻

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指導教授

李正中(Cheng-chung Lee)

審核日期

2014-7-28

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