博碩士論文 101296005 詳細資訊




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姓名 紀明儀(Ming-yi Ji)  查詢紙本館藏   畢業系所 光電科學與工程學系
論文名稱 傳播波與消逝波在多層與等效結構傳播特性之比較
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摘要(中) 為研究電磁波在多層結構內之傳播特性,經常將其多層結構根據等效介質理論(Effective Medium Theory) 以近似後的均勻介質表示。多層結構可以被設計成具有傳統材料沒有的電磁特性,例如光子晶體的頻帶隙 (bandgaps),以及雙曲超材料 (hyperbolic metamaterials) 的非正定介電常數 (indefinite permittivity) 等。人工材料提供了更廣的想像空間,及提高實現理論的可行性,等效介質理論則是一種能簡化描述多層週期結構的電磁特性之方法。以等效介質近似多層週期結構須注意有關結構尺寸與入射波長之間比例的條件,當條件有關的參數改變時,近似的結果會有所影響,影響結果為本論文中模擬之重點,結果說明各參數影響不一,且若能依不同介質或情況對參數做調整可以提高等效介質近似多層週期結構的可信度。
摘要(英) In order to study the propagation characteristics of electromagnetic waves in multilayer period structure, we usually approximate the multilayer period structure as an effective homogeneous medium by applying to it the Effective Medium Theory. Multilayer period structures as artificial materials can be designed to acquire the electromagnetic properties that do not appear in natural media, such like the bandgaps of photonic crystals and the indefinite permittivities of hyperbolic metamaterials. The artificial materials inspire human imagination and thus improve the feasibility of the theory. The effective medium theory is a convenient way to describe the propagation characteristics of the multilayer period structure. The ratio between the size of the constituents in the structure and the wavelength of the source wave must be properly chosen when we approximate the multilayer period structure as a homogeneous medium. If the parameters about the ratios are changed, the results of the approximation would be affected, and this fact is the main theme of this thesis. In this thesis we study for various cases all the parameters which influence the accuracy of effective medium theory and provide suggestions for reducing the difference between the effective medium and the real structure.
關鍵字(中) ★ 等效介質理論
★ 雙曲超材料
關鍵字(英)
論文目次 目錄
中文摘要 i
英文摘要 ii
致謝 iii
目錄 iv
圖目次 v
表目次 vi
第一章 緒論 1
1.1非均向性介質簡述 1
1.2 Hyperbolic Metamaterials 2
1.3研究動機與目的 2
第二章 非均向性介質中光傳播特性 4
2.1介質內光傳播特性 4
2.2反射與透射 8
2.3傳遞矩陣 14
2.4數值模擬方法 17
第三章 D’yakonov surface waves 21
3.1結構 21
第四章 模擬研究 24
4.1等效與多層結構結果之比較 24
總厚度相同週期數增加 25
有無吸收項對反射率與透射率的影響 28
結構是否對稱 32
入射面材質的差異 38
入射角度的影響 41
固定單週期長度增加週期數 45
改變填充因子 47
4.2 D’yakonov surface waves 在等效與多層結構的差異 53
改變填充因子 54
改變金屬厚度 55
改變均向性介質寬度 56
第五章 結論與未來展望 58
參考文獻 60
參考文獻 參考文獻
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指導教授 欒丕綱 審核日期 2014-10-24
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