臺灣博碩士論文加值系統

本論文主要是透過光脈衝整形器配合光導天線製作高功率可調窄頻兆赫輻射的研究和應用。我們利用脈衝整形器配合Freezing演算法來達成最短脈衝(transform-limited pulse)再使用Gerchberg-Saxton (GS)演算法來成功控制飛秒脈衝的型變，而透過脈衝串濾波的效果，可使光導天線輻射窄頻兆赫輻射。並模擬透過脈衝間距大於光導天線的飽和回復時間(saturation recovery time)可避免其輻射飽和進而突破飽和限制，使功率脈衝數倍增而達到高功\\率可調窄頻兆赫輻射。
此外，我們使用THz做為多波長干涉法的光源，成功量測了在THz波段下的液晶盒厚度。並使用THz-TDS量測22度下使用BL006製成的膽固醇液晶在THz波段下的光學特性，其雙折射率和THz的偏振方向無關，而尋常光和非尋常光的折射率分別為1.516~1.555和1.784~1.817，雙折射率為0.25~0.29。

This thesis utilized pulse shaping and Gerberg-Saxton algorithm to develop high power tunable narrowband terahertz radiation and applications. By the way of using Freezing algorithm and Gerberg-Saxton, pulse width, pulse duration, pulse position and pulse number can be controlled. The pulse train can be pumping source of high power tunable narrowband terahertz radiation, by avoid the saturations and different pulse duration. The simulation shown the result can have 5GHz narrowband width closing to commercial product.
Besides, we demonstrated the THz multi-wavelength interference method by using THz-TDS (terahertz time domain spectroscopy) to measure the liquid crystal cell gap. We have also used THz-TDS to investigate the complex optical constants and birefringence of cholesteric liquid crystal mixture BL006. The extraordinary (ne) and ordinary (no) indices of refraction at are 1.784-1.817 and 1.516-1.555 giving rise to a birefringence of 0.25–0.29 in 0.2THz~1.6THz.

論文審定書．．．．．．．．．．．．．．．．．．．．．．．．．．．Ⅰ
誌謝．．．．．．．．．．．．．．．．．．．．．．．．．Ⅲ
中文摘要．．．．．．．．．．．．．．．．．．．．．．．．．．．Ⅳ
英文摘要．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．Ⅴ
目錄．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．Ⅵ
圖次．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．Ⅷ
表次．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．
第一章 緒論．．．．．．．．．．．．．．．．．．．．．．．．1
第二章 脈衝整型系統與兆赫波輻射與接收之原理架構．．．．．．．．．．7
2.1 脈衝整型原理．．．．．．．．．．．．．．．．．．．8
2.2 脈衝整型系統架構．．．．．．．．．．．．．．．．．9
2.3 空間光調變器校準．．．．．．．．．．．．．．．．．11
2.4 光導天線輻射機制之介紹．．．．．．．．．．．．．． 14
2.5電光晶體取樣法 ．．．．．．．．．．．．．．．．．．17
第三章 脈衝串產生與其之兆赫輻射應用．．．．．．．．．．．． 20
3.1 雷射系統．．．．．．．．．．．．．．．．．．．．．． 21
3.2 自相關儀．．．．．．．．．．．．．．．．．．．．．． 22
3.3 互相關儀．．．．．．．．．．．．．．．．．．．．．25
3.4 頻率解析光閘．．．．．．．．．．．．．．．．．．．28
3.5 相位凍結演算法．．．．．．．．．．．．．．．．．．32
3.6 Gerchberg–Saxton演算法產生之脈衝串．．．．．．．．41
3.7 脈衝串應用於兆赫波之增強．．．．．．．．．．．．．56
3.8 結論．．．．．．．．．．．．．．．．．．．．．．．60
第四章 兆赫輻射應用於多波長干涉法之液晶膜厚量測．．．．．61
4.1 兆赫波時域解析光譜系統．．．．．．．．．．．．．．62
4.2 多波長干涉法．．．．．．．． ．．．．．．．．．．． 66
4.3 THz波段之液晶盒厚度量測．．．．．．．．．．．．．68
4.4 結論．．．．．．．．．．．．．．．．．．．．．．．77
第五章 膽固醇液晶在兆赫波之光學性質與應用．．．．．．．．78
5.1 膽固醇液晶簡介．．．．．．．．．．．．．．．．．．79
5.2 THz-TDS數據分析理論．．．．．．．．．．．．．．．82
5.3 膽固醇液晶在兆赫波段之光學性質．．．．．．．．．．84
5.4 膽固醇液晶在相位調控器之應用．．．．．．．．．．．89
5.5 結論．．．．．．．．．．．．．．．．．．．．．．．91
第六章 總結與未來展望．．．．．．．．．．．．．．．．．． 92
6.1 總結．．．．．．．．．．．．．．．．．．．．．．．93
6.2 未來展望．．．．．．．．．．．．．．．．．．．．．95
參考文獻．．．．．．．．．．．．．．．．．．．．．．．．．96

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