錐狀光纖與微米球共振腔耦合之研究與應用

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姓名

謝孟岐(Meng-chi Hsieh) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

錐狀光纖與微米球共振腔耦合之研究與應用
(The investigation of the coupling characteristics between microsphere resonator and tapered fiber coupler)

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摘要(中)

本論文探討錐狀光纖與微米球共振腔之耦合，並評估藉此機制實現積體化全光開關及感測器元件之應用。
實驗上我們選擇激發與探測 (pump and probe) 架構設計光路。藉由光學柯爾效應我們觀察到微米小球隨著pump光源強度不同而產生折射率微幅變化，進而使probe光所激發的耳語廊模場對應的共振波長發生紅移使穿透率發生變化。藉由此現象應用於全光開關其消光比為1.335dB，在開關對比度上尚有改善空間。但在感測器應用上，靈敏度可達1050nm/RIU，以目前研究來說，算是不錯的成果。

摘要(英)

In this thesis, we investigate the optical coupling between the tapered fiber coupler and microsphere resonator. The overall concept exploits are ultra-high Q and small modal volume in the resonator, leading to the significant decrease of the threshold power of nonlinearity. Using these advantages, we may broaden the applications to all optical switching and environmental sensors.
Experimentally pump-probe method was utilized in our setup. The modulation of the refractive index of the microsphere was observed under various input powers, and the WGM resonant wavelength shifted correspondingly. The extinction ratio is estimated to be 1.335dB between on/off states, and further improvement is no doubt necessary. We have lots of improvement. On the other hand, however, the sensitivity of this device is 1050nm/RIU, which is comparable to current integrated optical sensors. Further improvement of the sensitivity can be achieved by using a smaller resonator.

關鍵字(中)

★ 感測器
★ 全光開關
★ 耦合效率
★ 錐狀光纖
★ 微米小球

關鍵字(英)

★ sensor
★ all optical switching
★ tapered fiber
★ resonator
★ microsphere

論文目次

第一章導論................................1
1-1 前言....................................1
1-2 球形共振腔..............................3
1-2-1 品質因子...........................3
1-2-2 模場體積...........................5
1-3 球形共振腔的耦合方式....................6
1-4 球形共振腔應用..........................8
1-4-1全光開關.............................9
1-4-2 感測器..............................11
1-5 研究動機................................12
第二章理論介紹............................13
2-1 球形共振腔中的光場模態...............13
2-2 球形共振腔中的損耗機制...............19
2-3 錐狀光纖模場.........................22
2-4 耦合因子.............................25
2-5 非線性光學效應.......................27
第三章實驗與討論.........................30
3-1 實驗儀器架設與量測流程...............30
3-2 量測結果與分析.......................35
3-2-1 耦合模場量測結果分析.............35
3-2-2 品質因子量測結果與分析...........43
3-2-3 pump and probe 實驗量測結果與分析43
第四章結論與未來展望.....................50
4-1 結論.................................50
4-2 未來展望.............................51
參考文獻.....................................53

參考文獻

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指導教授

戴朝義(Chao-Yi Tai)

審核日期

2009-11-18

推文