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。

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.

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