研究生: |
劉玉茹 Yu-Ju Liu |
---|---|
論文名稱: |
微米X光共振腔之晶格常數變化研究 Study on the lattice-parameter variation of X-ray resonators |
指導教授: |
張石麟
Shin-Lin Chang |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
理學院 - 物理學系 Department of Physics |
論文出版年: | 2007 |
畢業學年度: | 95 |
語文別: | 中文 |
論文頁數: | 56 |
中文關鍵詞: | X光共振腔 、晶格常數變化 |
外文關鍵詞: | x-ray resonator |
相關次數: | 點閱:3 下載:0 |
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本論文主要研究分成兩部份,第一部分為微米X光共振腔的晶格常數變化研究。X光共振腔的兩片矽晶體平板(crystal plates),經過蝕刻過程,其晶格常數可能已與原先完美矽晶片時有所差異。利用高解析度單光器(High-Resolution Monochromator)以及X光在矽晶體中產生多光繞射的概念,以正向入射(布拉格角接近90度)的方法,使其中的(12 4 0)背向反射光在共振腔中來回反射,達到共振干涉的現象,進而得知共振腔的矽晶體平板之晶格常數
另一部份為同調性的複合式X光折射透鏡(Compound Refractive Lens , CRL)研究。設計能匯聚高能量X光的折射透鏡且融入多片的X光共振腔理念,預期能得到水平方向被壓縮的光;又此CRL的設計,考慮了24光繞射的情況,因此本論文將理論計算入射光在行經CRL的過程中,光點被壓縮的情況,以了解其物理機制。
This thesis work is divided into two parts :
The first part is a study on the lattice-parameter variation of the crystals used for X-ray resonators. An X-ray resonator that was prepared from a four-inch Si (001) crystal wafer by using the microelectronic lithography is composed of two crystal plates as reflecting mirrors. Multiple reflections take place within the crystal gap and generate forward-transmitted and back-reflected beams. The coherent interaction among the transmitted and the reflected beams inside the crystal plates and within the gap leads to cavity resonance. During the crystal etching processes, the lattice-parameter might be different from that of the original perfect crystal. By employing high-resolution backscattering from (12 4 0), we have measured the lattice-parameter variation of the silicon crystals in the range from 0.42 p.p.m. to 2 p.p.m.
The second part is the study on possible focusing effects in a coherent x-ray compound refractive lenses, CRL. In order to see the possibility of improving x-ray beam conditioners for producing a coherent and extremely parallel x-ray source for advanced high-resolution experiments, the multi-plate crystal cavities consisting of compound refractive lenses are employed. We have also simulated the situation that the incident beam is compressed during the process of passing through the CRL to understand its physics mechanism.
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