多重光能隙蛋白石結構光子晶體的製備

Fabrication of Opal-based Photonic crystal with multiple stop bands

陳衍泰(Chen Yen-Tai)

指導教授 ： 廖朝光

元智大學/工程學院/化學工程與材料科學學系/碩士(2004年)

摘要

本論文主要目的是利用不同大小二氧化矽粒子製備多光能隙蛋白石結構光子晶體和瞭解製備蛋白石結構光子晶體的程序對於其結構及光學性質的影響。不同大小且粒徑均一的粒子利用溶凝膠法並控制反應物濃度取得。光子晶體的製備採用重力沈積法，利用溶劑將粒子分散後置入沈積槽，使粒子進行自我排列及溶劑揮發。研究發現分散溶液的pH值、粒子進行自我排列時的環境濕度會影響光子晶體的光學性質及結構。製備多能隙光子晶體方面，我們嘗試利用不同製程製備，結果顯示是可行的。由於上下層不同大小粒子會互相影響，造成晶體結構及光學性質與單一大小粒子所製備的光子晶體不同，而且光能隙強度有衰減的現象。此外，瑕燒程序會破壞光子晶體的整體性質，但可增強晶體結構的機械強度。

關鍵字

光子晶體 ； 二氧化矽 ； 溶凝膠法 ； 沈積槽 ； 光能隙 ； 蛋白石

並列摘要

Opal-based photonic band gap (PBG) crystals, derived from a sol-gel method, with multiple stop bands were prepared. The fabricating procedure includes particle syntheses, dispersion, sedimentation, and thermal treatments. Each of the steps can affect the PBG properties. In this study, silica particles were synthesized by adjusting the ratio of TEOS, ammonia and water. The uniform particles can be obtained by using this method. The pH value of the dispersion and the humidity of the surrounding during sediment step affect the properties of PBG. Two layers of different particle sizes of PBG crystal were fabricated by different deposition conditions to demonstrate the feasibility of producing multiple stop bands. These conditions can affect the stack layers and structural regularity for forming the PBG layers. Besides, the optical property of PBG also was decreased by thermal treatment, but mechanical strength of the structure would be improved.

並列關鍵字

phtonic crystal