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研究生: 李淑蓮
Shu-Lian Lee
論文名稱: 磁性流體薄膜之磁色效應
Magnetochromatic effects in the magnetic fluid thin film
指導教授: 洪姮娥
Horng, Herng-Er
學位類別: 碩士
Master
系所名稱: 物理學系
Department of Physics
畢業學年度: 87
語文別: 中文
論文頁數: 51
中文關鍵詞: 磁性流體薄膜六角形晶格陣列光柵磁色效應
英文關鍵詞: magnetic fluid thin film, two-dimensional hexagonal lattice, grating, magnetochromatic effects
論文種類: 學術論文
相關次數: 點閱:389下載:0
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  • 高同質性的磁性流體薄膜在受到外加垂直磁場作用下,磁性粒子沿著外加磁場聚集形成磁性圓柱體。這些磁性圓柱體在薄膜中排列成二維的六角形晶格陣列,因此具有光柵的作用。而磁性圓柱體的間柱是在微米的範圍內,此範圍恰好能對可見光產生繞射作用。我們的結果發現當白光光源垂直入射磁流體薄膜,可得到一彩色的繞射圓環。我們稱其為磁色效應(Magnetochromatic effects)。對單一波長的入射光而言,其繞射光的強度在空間中的分布與光柵公式完全符合。
    由於磁性圓柱體的間距是可用許多參數來調制的,諸如外加磁場的強度、磁場增率、薄膜厚度…等。所以隨著不同參數的調制,使得磁性圓柱體的間距隨之改變,白光光源入射薄膜產生繞射圖樣亦有變化。上列參數對磁色效應的影響,在本研究作逐一的探討。

    When a magnetic field H was applied perpendicularly to the magnetic fluid thin film, the magnetic particles agglomerated to form particle columns. As the H was further increased, the crystallized two-dimensional hexagonal lattices of magnetic particle columns were constructed. Theses ordered hexagonal lattices could act as a 2D optical grating. Further, the distance between magnetic particle columns is in the range of micrometers and capable to generate diffraction pattern for visible light. Hence, a parallel white light ray normally passing through the thin film under the external field, the colorful diffraction pattern was observed. This phenomenon can be called the “magnetochromatic effects”. For specific wavelength incident light, the spatial distribution of the diffracted intensity was consistent with the grating equation.
    Due to the tunable distance of the magnetic columns by many parameters, such as external magnetic field strength, ramping rate and thickness of the thin film…etc, the distance of the magnetic columns varied with different parameters. The diffraction pattern also changed when the white light ray normally passed through the thin film. In our research, we made a series of explores in the relationship of the magnetiochromatic effects with the different parameters.

    封面內頁 簽名頁 授權書 iii 中文摘要 iv 英文摘要 v 目錄 vii 圖目錄 ix 第一章 緒論 1 第二章 實驗細節 3 2.1均勻磁性流體之薄膜製備 3 2.1.1均勻磁性流體之製備 3 2.1.2薄膜的製作 5 2.2有序結構的觀察 7 2.3磁色效應實驗技術 8 2.4光譜量測 10 第三章 磁色效應 12 3.1可調式光柵 12 3.1.1磁性流體光柵 12 3.1.2靜態之可調式磁流體光柵 13 3.1.3動態之可調式磁流體光柵 19 3.2磁色效應及其光譜分析 21 3.2.1磁色效應觀察與光譜分析 21 3.2.2可調式磁流體光柵對磁色效應的影響 27 3.2.3動態磁場增率對磁色效應的影響 35 第四章 理論探討 37 4.1理論介紹 37 4.1.1基本理論 37 4.1.2 Fresnel-Kirchhoff 公式 40 4.1.3圓孔繞射理論介紹 41 4.1.4光柵繞射理論介紹 44 4.2公式模擬 44 第五章 結論 47 參考文獻 49 致謝 51

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