利用光子晶體的能隙邊緣移動達成全光開關之研究

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姓名

莊秉達(Ping-Ta Chuang) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

利用光子晶體的能隙邊緣移動達成全光開關之研究
(The realization of all-optical switching by shifting of the bandedge of photonic crystals)

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摘要(中)

本研究利用紫外光照射光子晶體波導，造成光子晶體區域之折射率對比改變，進而產生光能隙位移（bandgap shift），使得操作於能隙邊緣波長的訊號光穿透率大幅下降或者上升，成為一全光開關機制。
實驗上以五氧化二鉭（Ta2O5）作為波導層，並且在波導上製作光子晶體結構；量測上，利用鎖模鈦藍寶石雷射作為入射光源（probe beam）、連續波紫外光作為幫浦光（pump beam），開關對比度達92.98%，未來的研究將著重於開關速度之提升。

摘要(英)

In this study, we use ultraviolet light as the pump beam to illuminate the waveguide which contains photonic crystal in it. The refractive index change results in the shift of the bandgap of the photonic crystal. The transmission of the signal beam operated at bandedge wavelengths is thereby modulated and all-optical switching is realized.
Experimentally, Ta2O5 is used as a material for the waveguide. E-beam lithogography technique is utilized to fabricate the photonic crystal structure in the waveguide. The performed on/off characteristic shows that a transmission contrast as high as 92.98% can be achieved. Future direction of work is discussed aiming at the improvement of the switching speed.

關鍵字(中)

★ 全光開關
★ 單光子吸收
★ 光能隙位移
★ 光子晶體

關鍵字(英)

★ all optical switch
★ single photon absorption
★ band shift
★ photonic crystals

論文目次

中文摘要……………………………………………………Ⅰ
英文摘要……………………………………………………Ⅱ
誌謝…………………………………………………………Ⅲ
總目錄………………………………………………………Ⅳ
圖目錄………………………………………………………Ⅵ
表目錄………………………………………………………Ⅸ
第一章導論……………………………………………1
1-1 前言………………………………………………1
1-2 全光開關閘之發展………………………………3
1-3 以光子晶體實現全光開關之簡介………………5
1-4 研究動機與論文大綱……………………………8
第二章理論介紹………………………………………10
2-1 光子能隙…………………………………………10
2-2 非線性光學效應…………………………………15
2-3 材料介紹…………………………………………17
2-4 單光子吸收………………………………………20
2-5 討論………………………………………………23
第三章光子晶體結構之模擬…………………………24
3-1 平面波展開法……………………………………24
3-2 時域有限差分法…………………………………28
3-3 改變Ta2O5光子晶體之折射率對比 ……………32
3-4 結果分析…………………………………………35
第四章元件之製作……………………………………37
4-1 元件之幾何結構…………………………………37
4-2 元件製作流程……………………………………40
4-3 端面研磨…………………………………………45
4-4 掃瞄式電子顯微鏡拍攝圖………………………47
4-5 討論………………………………………………48
第五章光子晶體全光開關之量測……………………49
5-1 實驗儀器架設與量測過程………………………49
5-2 能隙量測結果與討論……………………………55
5-3 分析幫浦光對於光能隙造成之變化……………58
5-4 以示波器顯示全光開關現象……………………66
5-5 結論………………………………………………69
第六章結論與未來展望………………………………70
參考文獻……………………………………………………71

參考文獻

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指導教授

戴朝義(Chao-Yi Tai)

審核日期

2008-9-22

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