週期性奈米結構的光學元件有十分廣泛的應用，包含光子晶體結構的濾光元件與蛾眼結構的抗反射元件。
本論文製作不同孔洞尺寸與形貌奈米結構的多孔質陽極化氧化鋁，並以此為模板，結合奈米壓印技術，製備具有週期性奈米結構的光學元件，並測試壓印結構之光學特性。
首先以聚乙二醇為添加劑，藉由不同聚乙二醇的添加量改變電解質的電阻，有效控制陽極化的電流密度，達到控制陽極化氧化鋁成長速率的效果。其次，反應面積亦會影響氧化鋁成長速率，反應面積與成長速率有呈反比的趨勢。探討不同尺寸與形貌的奈米結構對於光學性質影響發現，柱狀磷酸氧化鋁及壓印圓柱狀奈米結構具有光子晶體的性質，可濾去藍光。隨著結構尺寸由100nm增加到410nm，反射光波峰由421nm位移到441nm。改變陽極化與蝕刻擴孔時間可以得到不同高度與深寬比的尖錐狀磷酸氧化鋁，用以壓印之圓錐狀奈米結構，能消除基材的光學介質接面，其中較高深寬比的結構具有較長的等效介質範圍，可使光學穿透率由91%提升至95%，但由於結構本身為光子晶體，而使藍光波段之穿透率下降。以尖錐狀草酸氧化鋁壓印圓錐狀奈米結構能提升全波段可見光的光學性質，而使光學反射率由8.5%至降低至4.5%，穿透率則由91%提升至95%；利用雙面壓印的方式，能消除基材前後兩層光學介質接面，使反射率由9%降至1%，穿透率則由91%提升至99%。

The optical device with periodic nano structure has many applications, including color filter with photonic crystal and antireflection device with moth eyes structure.
In this thesis, we fabricated porous anodic alumina with different dimension and morphology, then used the alumina as a mold to perform nanoimprinting for preparing optical devices with periodic nanostructure.
In anodization system, we could control the growth characteristics of anodic alumina by adding different amounts of polyethyleneglycol (PEG), because PEG is a modulator in electrolyte. The PMMA nanopillar structure obtained by imprinting using the alumina stamp with straight structure is a kind of photonic crystal, it could allow most visible light but exhibit a blue appearance. The peak of reflection light shifts from 421nm to 441nm with increasing pillar dimension from 100nm to 410nm. We could also get nanocone structure obtained by imprinting using the alumina with tapered hole structure, fabricated by sequential anodization and etching steps. The nanocone structure obtained by using anodic alumina mold from phosphoric acid electrolyte could eliminate the junction of media between air and substrate. The structure with high aspect ratio has a wider effective medium region, so it could increase the optical transmittance from 91% to 95%. This structure is still a photonic crystal structure, so the transmittance in bluish purple light region is decreased. The nanocone structure imprinted using acid alumina anodizaed in oxalic acid could increase transmittance in all visible light wavelengths, and it decreases optical reflectance from 8.5% to 4.5%, but increases transmittance from 91% to 95%. We could eliminate junction of media on the top and bottom surfaces of the substrate by double layer imprinted PMMA nanocone strustures, where the optical reflectance could decrease from 8.5% to 1%, but the optical transmittance increases from 91% to 99%.

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