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系統識別號 U0026-1108201019234300
論文名稱(中文) 可全光控之染料摻雜液晶注入光子晶體光纖之研究
論文名稱(英文) All-optically controllable dye-doped liquid crystal infiltrated photonic crystal fiber
校院名稱 成功大學
系所名稱(中) 光電科學與工程研究所
系所名稱(英)
學年度 98
學期 2
出版年 99
研究生(中文) 黃彥禎
研究生(英文) Yan-Jhen Huang
學號 l7697109
學位類別 碩士
語文別 中文
論文頁數 80頁
口試委員 指導教授-李佳榮
口試委員-許佳振
口試委員-莫定山
口試委員-于欽平
中文關鍵字 光子晶體光纖  液晶  全光調控 
英文關鍵字 photonic crystal fiber  liquid crystal  all-optically controllable 
學科別分類
中文摘要 本論文首次研究全光調控染料摻雜液晶注入之光子晶體光纖(dye-doped liquid crystal infiltrated photonic crystal fiber,DDLCIPCF)。實驗結果顯示DDLCIPCF纖核的整體穿透度會隨著照射UV光(365nm)的時間增加而先降後升且伴隨穿透光譜整體紅位移,在此之後改用另外一道綠光(532nm)照射會使得纖核變化的穿透光譜分佈回復。此DDLCIPCF之光子能隙結構分佈可全光調控性主要乃歸因於DDLCIPCF纖覆微孔區內的偶氮染料因照射UV光從棒狀trans態轉變到彎曲狀cis態的光同素異構化反應引致液晶等溫地由向列相先轉變為多重區域散射態再轉變為各向同性之isotropic態;而照射綠光會使偶氮染料從cis態轉變回trans態的光同素異構化反應引致液晶等溫地從isotropic狀態先轉變回散射態再轉變回向列相。以上DDLCIPCF光子能隙結構的變化乃由於照光期間散射態的出現以及纖核與纖覆間折射率差變化所致,前者造成纖核整體穿透度改變,後者造成纖核穿透頻譜的位移。
英文摘要 This thesis demonstrates for the first time an all-optically controllable dye-doped liquid crystal infiltrated photonic crystal fiber (DDLCIPCF). The transmittance in the core of the DDLCIPCF can decrease and then increase with a concomitant increasing red-shift of the core transmitted spectrum by increasing the irradiation time of one UV beam, and recovers with increasing the irradiation time of one green beam on the DDLCIPCF. The reversible all-optical controllability of the photonic band structure of the DDLCIPCF is attributable to the UV-beam-induced isothermal nematic(N) → scattering(S) → isotropic(I) transition and green-beam-induced isothermal I → S → N transition of the LCs via trans→cis and cis→trans back isomerizations of the azo dye, respectively, in the DDLC-filled regions of the cladding. During the light irradiation, the appearance of the scattering state and the variation of the index modulation between the core and cladding of the fiber cause the variation of the photonic band structure of the DDLCIPCF, in which the former and the latter lead to the variation of the core transmittance and the shift of the core transmitted spectrum of the DDLCIPCF.
論文目次 摘要 I
Abstract II
致謝 III
緒論 1
第一章 液晶介紹 3
1-1 何謂液晶 3
1-2 液晶分類 4
1-2-1 圓盤狀液晶分子 5
1-2-2 棒狀液晶分子 6
1-3 液晶特性 11
1-3-1光學異向性 11
1-3-2介電異向性 15
1-3-3溫度對液晶的影響 16
1-3-4連續彈性體理論 17
第二章 相關理論與機制 19
2-1光子晶體光纖簡介 19
2-2光子晶體光纖分類與理論 22
2-2-1光子晶體光纖分類 22
2-2-2光子晶體光纖理論 24
2-3全光調控染料摻雜液晶注入光子晶體光纖 33
2-3-1偶氮染料特性與其和液晶之間交互作用 33
2-3-2染料摻雜液晶注入光子晶體光纖 36
第三章 實驗製備與架構 38
3-1材料介紹 38
3-2製作流程 41
3-2-1染料摻雜之液晶灌入光子晶體光纖 41
3-2-2染料摻雜之液晶灌入玻璃空樣品 42
3-3樣品觀察與實驗架設 43
3-3-1 吸收頻譜量測 43
3-3-2 DDLCIPCF的偏光顯微鏡觀察圖像 45
3-3-3 全光調控DDLCIPCF實驗裝置 46
第四章 實驗結果與討論 49
4-1全光調控下DDLCIPCF橫切面影像之量測 49
4-1-1 UV光照射後DDLCIPCF橫切面影像之量測 49
4-1-2 DPSS 綠光雷射照射後,DDLCIPCF之橫切面影像量測 56
4-1-3 UV光照射後,DDLCIPCF以熱方式自然回復之橫切面影像量測 59
4-2全光調控下,DDLCIPCF在偏光顯微鏡下之穿透影像觀測 61
4-3全光調控下,DDLCIPCF光纖纖核穿透光譜量測 66
4-4摻雜不同濃度偶氮染料之DDLCIPCF之纖核穿透光譜 73
第五章 結論與未來工作 75
5-1結論 75
5-2未來展望 76
參考文獻 77

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