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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 吳靜雄 | |
| dc.contributor.author | Chih-Hao Chen | en |
| dc.contributor.author | 陳致豪 | zh_TW |
| dc.date.accessioned | 2021-05-16T16:18:03Z | - |
| dc.date.available | 2015-08-20 | |
| dc.date.available | 2021-05-16T16:18:03Z | - |
| dc.date.copyright | 2013-08-20 | |
| dc.date.issued | 2013 | |
| dc.date.submitted | 2013-08-15 | |
| dc.identifier.citation | [1] D. F. Vanderwerf, Applied Prismatic and Reflective Optics, SPIE press, 2010
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/5887 | - |
| dc.description.abstract | 傳統的偏振器是吸收特定極化的偏振光，因此光的使用效率最高只有百分之五十。為了提高光使用效率，本論文利用極化分光器實現了一種應用於可見光的高光使用效率(light utilization efficiency, LUE)的偏振器。我們設計的極化分光器，在特定情況下，能使用百分之八十的光，最多則有百分之九十的光可利用。
本論文設計的極化分光器是使用繞射光柵(Diffraction grating)。並利用利特羅裝置(Littrow mounting)的現象來分析其特性。數值方法是採用嚴格耦合波法(Rigorous Coupled Wave Analysis, RCWA)。我們利用一些物理理論和公式在論文中調整各個參數來達到優化的目的。 傳統的極化分光器有的是利用雙折射效應或多層結構，雖然不會有過多的損耗，卻因為入射角度的允許範圍不大或是體積龐大而受限。另有一種極化分光器是利用金屬的線柵結構，這種結構雖然能夠達到很好的消光比，而且也能夠應用在整個可見光波段，卻很難避免損耗，其中又以藍光波段為甚，論文的例子中至少都有百分之十的損耗，最多則約有百分之二十的損耗。也因此，和我們的設計相比，能夠利用的光最多相差約百分之十，最少也有百分之三到四的差距。 雖然我們的設計未能涵蓋整個可見光波段，但這個問題亦能分化成紅綠藍三個波段個別解決。此外，藉由光源頻譜的高斯函數近似，適當地對波段取捨，能進一步提高允許的入射角度範圍。同時，在論文的最後，我們針對光源的出光角度，介紹了幾種能夠縮小出光角度的方法。 極化分光器的一個應用是液晶顯示器的背光模組。一旦提高了光使用率，就能進一步達到節能的效果。 | zh_TW |
| dc.description.abstract | This thesis designs a polarization beam splitter (PBS) to achieve high light utilization efficiency (LUE). Compared with conventional absorption polarizers of which the LUE is at most 50%, the LUE of our design is about 80% under certain conditions. And, the 90% maximum light utilization efficiency was also achievable.
We use dielectric diffraction grating to design the PBS and employ the so-called Littrow mounting phenomenon to analyze its characteristics. We use the 'Rigorous Coupled Wave Analysis'(RCWA) to perform the numerical simulation. And we also describe the optimization process by using the physical theorems and equations. Some conventional PBSs employ birefringent crystals, multilayer structure, and birefringent multilayer structure. However, these attempts suffer either the relatively small acceptance angle or very bulky. The wire-grid polarizer/PBS which utilizes metal is also commercially available; nevertheless, the attenuation due to metals is inevitable. Compared with a wire-grid polarizer/PBS example in this thesis, our design would lead nearly 10% higher LUE in blue-violet band. However, there are some issues we need to concern about. First, we cannot apply whole visible band with one PBS. Second, the field of view (acceptance angle) of our PBSs is relatively too small to collect all light emitted from light sources with large divergence angle. To deal with the first issue, we may use red, green and blue light-emitting diodes (LED) for three separated band. The field of view could be improved by ignoring low-energy wavelengths in a Gaussian approximated LED spectrum. At the end of this thesis, we introduced some possible methods to reduce the divergence angle of LED light sources. An application of the PBS is backlight units (BLU) in the liquid crystal display (LCD). The usage of PBS can increase light utilization efficiency, and therefore, achieve high efficient energy utilization. | en |
| dc.description.provenance | Made available in DSpace on 2021-05-16T16:18:03Z (GMT). No. of bitstreams: 1 ntu-102-R00941063-1.pdf: 5202043 bytes, checksum: cb52b9bda45ae4fda3f3f8778bdc464e (MD5) Previous issue date: 2013 | en |
| dc.description.tableofcontents | 口試委員審定書.................................................................................................................... i
誌謝 ..................................................................................................................................... iii 中文摘要 .............................................................................................................................. v Abstract ............................................................................................................................. vii 目錄 ..................................................................................................................................... ix 圖目錄 ............................................................................................................................... xiii 表目錄 ............................................................................................................................... xix 第一章、緒論 ...................................................................................................................... 1 第一節、文獻中的極化分光器 ........................................................................................ 1 一、雙折射晶體(Birefringence Crystal) ....................................................................... 1 1. Nicol 極化器/極化分光器 ........................................................... 1 2. Glan–Foucault 極化器/極化分光器 ............................................. 2 二、多層結構(multilayer) ............................................................................................ 5 1. MacNeille 極化分光器 ................................................................. 5 2. 多層雙折射介面(Birefringent Multilayer) .................................... 6 三、光柵結構(grating) ................................................................................................. 7 1. 線柵結構(wire-grid)...................................................................... 8 2. 繞射光柵(diffraction grating) ...................................................... 12 第二節、極化分光器的應用 .......................................................................................... 14 一、液晶顯示器(Liquid Crystal Display, LCD) .......................................................... 14 1. 提高濾色片效率 ......................................................................... 15 2. 提高極化光使用率 ..................................................................... 16 二、立體顯示(3D display).......................................................................................... 18 第三節、論文大綱與編排 ............................................................................................. 20 第二章、理論與數值分析 ................................................................................................. 21 第一節、利特羅裝置的物理機制 .................................................................................. 21 一、光柵中的模態(mode)解 ...................................................................................... 21 1. TE 模態 ...................................................................................... 22 2. TM 模態 ..................................................................................... 23 二、利特羅裝置的物理機制 ...................................................................................... 25 1. 低反射率 .................................................................................... 25 2. 模態分析 .................................................................................... 25 第二節、數值方法 ......................................................................................................... 28 一、平面波展開法 ..................................................................................................... 28 二、特徵值問題(eigenvalue problem) ........................................................................ 29 三、邊界條件 ............................................................................................................. 30 四、收斂性................................................................................................................. 31 五、能量守恆 ............................................................................................................. 31 六、後話 .................................................................................................................... 32 第三節、極化分光器的設計 .......................................................................................... 33 一、相同neff的進一步探討 ........................................................................................ 33 二、設計的方向與參數 ............................................................................................. 35 三、RGB 三色的頻段 ................................................................................................ 37 四、一階繞射角和波長的關係 .................................................................................. 37 五、各個變數的影響 ................................................................................................. 39 1. 光柵深度d.................................................................................. 39 2. 光柵介質n1 ................................................................................. 42 3. 光柵週期Λ .................................................................................. 45 4. 穿透介質nt與入射介質ni ........................................................... 48 六、RGB 極化分光器 ................................................................................................ 49 七、立體角度 ............................................................................................................. 53 第三章、寬頻極化分光器 ................................................................................................. 59 第一節、物理機制 ......................................................................................................... 59 第二節、寬頻極化分光器 ............................................................................................. 61 一、設計的方向與參數 ............................................................................................. 61 二、各個變數的影響 ................................................................................................. 63 1. 光柵深度d.................................................................................. 63 2. 光柵週期Λ .................................................................................. 66 3. 填充因子f .................................................................................. 66 4. 穿透介質nt ................................................................................. 67 三、立體角度 ............................................................................................................. 68 四、稜鏡(prism) ......................................................................................................... 68 五、總結 .................................................................................................................... 70 第四章、光源出光角度與極化分光器集光角度研究 ....................................................... 71 第一節、調整出光角度的可能方式 .............................................................................. 71 一、一般LED 的出光角度 ........................................................................................ 71 二、可能的方式 ......................................................................................................... 72 第二節、高斯近似的發光頻譜 ...................................................................................... 76 一、高斯近似 ............................................................................................................. 76 二、立體角度的轉換 ................................................................................................. 78 三、各個波段的取捨 ................................................................................................. 78 第三節、光使用效率 ..................................................................................................... 83 第五章、結論 .................................................................................................................... 85 附錄一、Glan–Thomson 極化分光器的允許角度範圍 .................................................... 87 附錄二、第二章公式推導與探討 ...................................................................................... 91 附錄三、三維嚴格耦合波法 ........................................................................................... 103 參考文獻 .......................................................................................................................... 115 | |
| dc.language.iso | zh-TW | |
| dc.subject | 極化分光器 | zh_TW |
| dc.subject | 偏振器 | zh_TW |
| dc.subject | 可見光 | zh_TW |
| dc.subject | 繞射光柵 | zh_TW |
| dc.subject | 利特羅裝置 | zh_TW |
| dc.subject | 高效率偏振器 | zh_TW |
| dc.subject | 嚴格耦合波法 | zh_TW |
| dc.subject | Rigorous Coupled Wave Analysis | en |
| dc.subject | Polarizer | en |
| dc.subject | High efficient polarizer | en |
| dc.subject | Polarization beam splitter | en |
| dc.subject | visible light | en |
| dc.subject | Diffraction grating | en |
| dc.subject | Littrow mounting | en |
| dc.title | 應用於可見光波段高效率偏振器之設計 | zh_TW |
| dc.title | Design of High Efficient Polarizers for Visible Light | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 101-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 王倫,曹恆偉,李三良 | |
| dc.subject.keyword | 偏振器,高效率偏振器,極化分光器,可見光,繞射光柵,利特羅裝置,嚴格耦合波法, | zh_TW |
| dc.subject.keyword | Polarizer,High efficient polarizer,Polarization beam splitter,visible light,Diffraction grating,Littrow mounting,Rigorous Coupled Wave Analysis, | en |
| dc.relation.page | 120 | |
| dc.rights.note | 同意授權(全球公開) | |
| dc.date.accepted | 2013-08-16 | |
| dc.contributor.author-college | 電機資訊學院 | zh_TW |
| dc.contributor.author-dept | 光電工程學研究所 | zh_TW |
| 顯示於系所單位： | 光電工程學研究所 | |
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