請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/38283
標題: | 有限光子晶體波導開口面結構對光波傳輸的影響 Effects of the Gateway Surface Structures on Light Transmission through a Finite Photonic Crystal Waveguide |
作者: | Ching-Yeh Kuo 郭璟曄 |
指導教授: | 江衍偉 |
關鍵字: | 光子晶體,波導,出口結構,入口結構結構,指向性,穿透強度,刻痕,凸起, photonic crystal,waveguide,opening structure,entrance structrue,directional,transmission,groove,jut, |
出版年 : | 2005 |
學位: | 碩士 |
摘要: | 從先前對於金屬薄膜系統的研究中可得知,對薄膜表面的結構作適當設計可使光波的穿透行為有相應的改變。以此為基礎,我們藉模擬方式探討有限光子晶體波導的開口面結構對光波傳輸特性的影響。我們採用時域有限差分法進行數值模擬。所探討的二維光子晶體波導是由方形排列的介質圓柱所組成。在本論文中,我們首先研究光波行為之於出光面結構的相依性。在這個主題中,我們討論四個主要參數。除此之外,我們發現改變波導受光面的結構會影響光波的穿透強度。在受光面的波導兩側適當的設計ㄧ對凹槽或是突起,就可以有效的改善原本不佳的穿透係數。最後,我們也探討了凹槽或是突起的數目對於改善穿透能力的影響。 From the previous study on a metallic thin film system, it is found that properly designing one or two surface structures provides flexible change in light beaming phenomena. Based on this, computationally, we investigate the properties of light coming in and out of a finite photonic crystal waveguide with specifically designed surfaces. Numerical simulations are conducted by using the finite-difference time-domain method. The two-dimensional waveguide is composed of square-lattice dielectric cylinders. In this thesis, the dependence of the field intensity distribution, when light escapes the waveguide, on the geometry of the exit side is revealed. There are four main factors discussed on this topic. Besides, it is found that changing the structure of the illuminated side affects the total transmitted intensity only. By patterning a pair of grooves or juts aside the waveguide on the illuminated side, transmitted power can be improved efficiently. Also, the effects on light transmission enhancement capability of the numbers of grooves and juts is discussed. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/38283 |
全文授權: | 有償授權 |
顯示於系所單位: | 光電工程學研究所 |
文件中的檔案:
檔案 | 大小 | 格式 | |
---|---|---|---|
ntu-94-1.pdf 目前未授權公開取用 | 2.42 MB | Adobe PDF |
系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。