隨著渦流光在近代光學中迅速崛起，各種應用接連出現，小到微米等級粒子的操控，大到太陽系外天文星體的觀察，其中又以近期在通訊上的應用最為亮眼，打破以往的傳輸極限，開創嶄新的加密可能性。當應用的概念漸趨成熟，穩定的渦流光來源就顯得重要，傳統的螺旋狀波板(spiral phase plate)以波板厚度控制光程差，過於厚重且功能單一，較後來出現的平面相位元件q-plate，以雙折射材料—液晶的軸向變化控制光程差，僅需薄薄數層液晶便可調控完整波長的光程，克服了元件厚重的問題，但須持續輔以電壓調控，且在同一時間對應的工作頻寬較窄。為了即將到來的各種應用，我們必須開發出穩定、輕便、工作頻寬廣，且具有更多功能調控性的平面相位元件。
本論文將分子馬達材料摻混入膽固醇液晶封入具輻射狀配向之空玻璃樣品中，製成具有廣頻範圍調控性且可手性翻轉之光渦流產生元件。實驗中，經由不同強度的紫外光(吸收波峰在392 nm)照射後，此元件之反射波段可連續地由中心波長425 nm位移至紅外波段的850 nm，直至螺旋結構解螺旋，再經過旋性反轉後，反射波段又可逐漸藍移回復，可從850 nm逐漸移回475 nm處，分別涵蓋正反旋性425 nm與375 nm(於光譜儀可偵測最大頻譜範圍內)。關閉UV光之照射後，樣品將逐步逆向回復原先旋性與反射波段，此過程可透過加熱來提高速率。本實驗能夠製備出單一光學元件具備光子能隙之超廣頻可動態調控性與旋性可逆性，對於未來發展具備可多功能可動態調控之先進平面光學元件是相當重要的進展。
本論文分成兩部分，第一部分探討樣品同時接受光與電壓刺激時光學特性(光子能隙)的變化，照紫外光可促使分子馬達做同分異構物歷程使整體旋性反轉，外加直流電壓使樣品升溫則促使其回復，兩者效應最後終將達到動態平衡。藉由改變紫外光強度與外加電壓大小可適當調整此平衡，使樣品穩定在特定旋性與波段。
論文第二部分乃驗證此單一元件具備產生可寬頻波長變化與旋性反轉之渦流光。實驗中可透過麥克森干涉法，分別使用紅(633 nm)、綠(532 nm)、藍(488 nm)三原色雷射光球面與平面波進行干涉以檢驗經由此液晶光渦流產生器產生的渦流光輸出特性，實驗結果符合理論預測，證實此單一光渦流輸出元件確實可任意地調控其操作波長與旋性特性。

This thesis demonstrates an advanced planar phase modulator called Bragg-Berry optical vortex generator (BBOVG) by filling chiral molecular motor doped liquid crystals into an indium-tin-oxide-coated glass cell, which is pretreated with azimuthal photo-alignment pattern. The material with a self-assembled helical structure along the pattern forms a BBOVG device, which possesses an ultra-broadband tunable photonic bandgap (PBG) and chirality invertibility. The PBG can be tuned through the full-visible region to near-infrared by UV light and applied DC voltage, in both left-handed and right-handed helical structures. The optical vortex properties of reflected beam at wavelengths of red (632.8 nm), green (532 nm), and blue (442 nm) are verified by Michelson interferograms.

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