Ptychographic同調X光繞射顯微術之數值模擬

Numerical Simulations of Ptychographic Coherent Diffraction Imaging

謝臣安(Hsieh, Chen An)

指導教授 ： 黃迪靖 ； 吳文斌

國立清華大學/原子科學院/先進光源科技學位學程/碩士(2015年)

https://doi.org/10.6843/NTHU.2015.00013

摘要

鑒於近幾年的發展，人們對高解析力影像科技之需求越來越大，解析力要求愈來越高，不論是尖端科學的研究或產業應用的研發。因此，促使了一新穎的超高解析力影像科技蓬勃發展，其為同調X 光繞射顯微術。又基於Walter Hoppe 之貢獻，Ptychography 為同調X 光繞射顯微術中最成功的方法之一。其提供超高解析力之顯微影像，藉由同調X 光繞射技術，以部分重疊之方式掃描原待測樣品，獲取多張繞射圖騰的影像訊號，並利用Ptychographic 迭代引擎之演算法，而重構出原待測樣品的超高解析影像。我們的研究著重於嘗試更增進此技術，方式為結合兩種同調X 光影像科技，分別為Ptychography 顯微術與結構式照明顯微技術中的隨機空間分布陰影投影方法。目前以數值模擬為研究方式，我們的模擬展示了其新技術的效果，並嘗試克服同調X 光繞射顯微術中待解決的議題，如相位提取演算法之收斂，唯一性問題與過大的繞射光斑圖騰之動態範圍。

關鍵字

同調X光繞射顯微術 ； 同步輻射

並列摘要

For the past few years, the increasing demand for high resolution imaging in scientific research and industrial applications is motivated by improving a novel imaging technique, such as coherent X-ray diffraction imaging (CXDI). In addition, building on the original work by Walter Hoppe, one of the most successful CXDI approach called ptychography provides very high resolution images by employing complementary diffracted data from overlapping illumination and a ptychographic iterative engine (PIE) algorithm. Our works focus on developing the ptychographic
technique by combining with the structured illumination scheme, especially with random arrangements of amplitude objects. Our research results are achieved by using the numerical simulations. We numerically demonstrated the effectiveness of ptychography with structured illuminations to enhance the convergence of phase retrieval, to resolve the problem of uniqueness and the large dynamic range of measured speckle patterns.

並列關鍵字

Ptychography ； Coherent Diffraction Imaging ； Synchrotron

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