超強耦合共振腔之光致發光研究

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姓名

黃明鴻(Ming-Hung Huang) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

超強耦合共振腔之光致發光研究
(Photoluminescence study of Ultra-strongly coupled cavity)

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至系統瀏覽論文 (2029-6-23以後開放)

摘要(中)

在本論文中，我們選用具有雙吸收峰的有機材料F8BT作為共振腔的主動層，建構出超強耦合共振腔架構。在該架構中，主動層同時擔任光子源以及激子源，這樣的設計使得我們能夠製作出具有更強耦合強度的元件，進而對其背後的物理現象進行詳細的探討。在共振腔中的光子與激子進行耦合作用時，會產生一種由光和物質所組成並有玻色子特性的混成態粒子，稱為偏極子。在具有雙吸收峰主動層的共振腔中，耦合作用會導致新的能量分支的形成，這些分支分別稱為上支、中支和下支。當共振腔中光子的能態與激子能態相同時，上支與下支之間的能量差被稱為拉比分裂。若拉比分裂大小超過激子能量的20 %時，則稱該共振腔達到了超強耦合。
在實驗開始前，我們會使用光學薄膜設計軟體Macleod來模擬各膜層的厚度，確保下支的位置正確對應到F8BT的光致發光PL位置，並且模擬出DBR布拉格反射鏡中的高低折射率材料的厚度。我們使用不同反射鏡的共振腔去探討其對耦合特性的影響，其中DBR布拉格反射鏡中心波長是設計在515 nm，高反射率頻寬僅包到F8BT的單吸收峰。最後結果得出不同反射鏡的共振腔均可以達到30 %附近的耦合強度，達到了超強耦合。使用不同功率的激發光源去激發DBR布拉格反射鏡共振腔，可以發現到隨著功率的增加，光譜上的能量會往低角度聚集，產生與雷射相同的特性。

摘要(英)

In this paper ,we selected the organic material F8BT,which has dual absorption peaks,as the active layer of the resonant cavity to construct a Ultra-strongly coupled cavity structure. In this setup , the active layer functions as both the photon and exciton source . This design allows us to fabricate devices with increased coupling strength,enabling a detailed investigation of the underlying physical phenomena . When photons and excitons within the resonator couple , they from a hybrid state particle composed of light and matter , exhibiting bosonic characteristics , known as a polariton . In resonators with a dual-peak active layer , the coupling leads to the formation of new energy branches , referred to as the upper、middle and lower branches . When the photon and exciton energy states in the resonator align , the energy difference between the upper and lower branches is called the Rabi splitting . If the Rabi splitting exceeds 20 % of the exciton energy , the resonator is considered to have achieved strong coupling .
Before the experiment begins , we utilize the optical thin film design software Macleod to simulate the thickness of each layer , ensuring the lower branch correctly aligns with the photoluminescence (PL) position of F8BT , and to model the thicknesses of high and low refractive index materials in the Distributed Bragg Reflector (DBR) mirrors . We use resonators with different mirrors to explore their effects on coupling characteristics , where the central wavelength of the DBR mirrors is designed at 515 nm , and the high reflectance bandwidth only covers the single absorption peak of F8BT . The results show that resonators with different mirrors can achieve a coupling strength of about 30 % , indicating strong coupling . By exciting the DBR resonators with light sources of varying powers , we observe that as power increases , the energy on the spectrum concentrates towards lower angles , exhibiting characteristics similar to those of a laser .

關鍵字(中)

★ 超強耦合
★ 偏極子
★ 有機材料

關鍵字(英)

★ Ultra-strongly coupled
★ polariton
★ Organic material

論文目次

摘要 i
Abstract ii
致謝 iii
目錄 iv
圖目錄 vii
表目錄 ix
第一章緒論 1
1-1高分子有機發光二極體 1
1-2有機偏極子共振腔元件 2
1-3研究動機 3
第二章基本原理 4
2-1激子 4
2-2偏極子 4
2-3共振腔品質因子(Q-factor) 5
2-4 DBR反射鏡 5
2-5膜矩陣 7
2-5-1單層膜的膜矩陣 8
2-5-2多層膜的膜矩陣 10
2-6光子與激子的耦合特性 11
2-6-1光子模態 12
2-6-2哈密頓量 14
第三章實驗製程與方法 21
3-1 元件材料 21
3-1-1 F8BT(Poly(9 , 9-dioctylfluorene-alt-benzothiadiazole)) 21
3-1-2 甲苯(Toluene) 21
3-2元件製程設備 21
3-2-1熱阻式蒸鍍系統(Thermal Evaporation Coater) 21
3-2-2手套箱(Glove Box) 23
3-2-3旋轉塗佈機(Spin Coater) 23
3-3元件量測設備 24
3-3-1紫外/可見/紅外光光譜儀 24
3-3-2積分球量測系統 25
3-3-3即時多角度光譜量測系統 26
3-4實驗步驟 29
3-4-1 玻璃基板的清洗 29
3-4-2 DBR布拉格反射鏡 29
3-4-3 共振腔的製程 30
第四章實驗結果與討論 31
4-1 F8BT介紹 31
4-2 反射鏡 32
4-2-1 金屬反射鏡 32
4-2-2 DBR布拉格反射鏡 33
4-3 耦合元件 34
4-3-1 雙鋁共振腔 35
4-3-2 雙銀共振腔 39
4-3-3 DBR布拉格反射鏡共振腔 43
4-4 對不同反射鏡共振腔的討論與改善 47
第五章結論與未來展望 49
參考文獻 50

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指導教授

張瑞芬(Jui-Fen Chang)

審核日期

2024-6-26

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