本論文使用一種非接觸式的配向方式，藉由此方法來減少液晶光子晶體光纖的傳輸損耗，由於光引致偶氮染料吸附於光子晶體光纖的空氣孔度內部的表面上，光子晶體光纖內的空氣孔洞邊界力量因為光配向的效果而變強使得液晶在孔洞內具有較一致性的排列。
光子晶體光纖中的液晶因為光配向而獲得固定性邊界使得液晶
的散射降低，透過十分鐘中以內的光配向將從液晶散射而來的傳輸損耗由-2.8dB/cm 降為-1.3dB/cm 且可以改善電場的調變，除此之外光配向也在電控效應上與液晶的快速動態反應時間上也具有功效，此降低損耗的液晶光子晶體光纖可以有效的應用於其他的液晶光子晶體光纖元件。

This work presents a novel loss-reduced photonic liquid-crystal
fiber (PLCF) using the non-contact photo-alignment method. The photo-excited and adsorbed azo dye on the capillary surface of a PLCF induces uniform and highly ordered orientation of the LC. The anchoring force of the photo-alignment effect is combined with that generated by surface boundary conditions of the photonic crystal fiber (PCF).
Transmission loss resulting from LC scattering can be reduced from -2.8db/cm to -1.3db/cm within 10min. This photo-induced alignment yields a permanent boundary for the LC in the PCF that reduces scattering loss, and can be further modulated by electrical fields. The electrical tunable effect and fast dynamic response of the photo-aligned PLCF are also presented. This low-loss PLCF can be applied conveniently in various PLCF devices.

摘要----------------------------------------------------------------------------I
Abstract-----------------------------------------------------------------------II
目錄---------------------------------------------------------------------------III
圖目錄------------------------------------------------------------------------VI
1.緒論-------------------------------------------------------------------------1
2.介紹 ------------------------------------------------------------------------3
2.1 液晶-----------------------------------------------------------------------3
2.2 光子晶體 ----------------------------------------------------------------5
2.3 光子晶體光纖-----------------------------------------------------------7
2.4 液晶光子晶體光纖---------------------------------------------------14
3.理論介紹-----------------------------------------------------------------16
3.1 液晶光子晶體光纖損耗相關理論---------------------------------16
3.2 液晶在光子晶體光纖內的排列------------------------------------18
3.2.1 正型液晶光子晶體光纖的排列與光譜變化-------------------21
3.2.2 負型液晶光子晶體光纖的排列與光譜變化-------------------22
3.3 光引致染料分子轉向效應------------------------------------------23
3.3.1 正力矩效應與負力矩效應----------------------------------------25
3.3.2 偶氮染料同素異構化反應----------------------------------------26
3.3.3 吸附效應-------------------------------------------------------------27
4.實驗方法與過程--------------------------------------------------------29
4.1 材料介紹---------------------------------------------------------------29
4.1.1 向列型液晶K15----------------------------------------------------29
4.1.2 偶氮染料Methyl Red ---------------------------------------------30
4.1.3 光子晶體光纖MA-8------------------------------------------------31
4.2 設備介紹---------------------------------------------------------------31
4.3 實驗方法---------------------------------------------------------------34
4.3.1 液晶光子晶體光纖的製作---------------------------------------34
4.3.2 光子晶體光纖的傳輸頻譜量測---------------------------------38
4.3.3 光配向實驗---------------------------------------------------------39
4.3.4 光子晶體光纖反應時間量測------------------------------------40
5. 結果與討論--------------------------------------------------------------42
5.1 配向實驗前後光學顯微鏡圖像比較------------------------------42
5.2 配向實驗前後傳輸頻譜變化情形---------------------------------45
5.3 激發光強度與傳輸頻譜變化情況---------------------------------47
5.4 配向實驗前後電控實驗傳輸光譜實驗結果---------------------49
5.5 配向實驗前後反應時間實驗成果---------------------------------51
6. 總結與未來展望--------------------------------------------------------53
6.1 總結---------------------------------------------------------------------53
6.2 未來展望---------------------------------------------------------------54
7. 參考文獻-----------------------------------------------------------------55

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