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题名	双光子及多光子关联成像性质的理论研究
作者	白艳锋
学位类别	博士
答辩日期	2008
授予单位	中国科学院上海光学精密机械研究所
导师	韩申生
关键词	双光子关联成像 强度关联函数 强度波动关联 可见度 量子噪声
其他题名	Theoretical investigation of two- and multi-photon correlated imaging properties
中文摘要	双光子关联成像又称为“鬼成像”，是近几年量子信息和成像光学的交叉学科前沿。其研究成果不仅推动了量子光学与成像光学等学科的发展而且已经显示出在纳米技术、生物科技、高能物理等多个领域的应用。 由于双光子关联成像发展的时间尚短，与成像光学的波动光学相比较，双光子关联成像的理论还很不完备。本论文主要就双光子及多光子关联成像过程中的一些成像性质进行了深入的研究，取得的主要创新结果如下： 1. 探讨了双光子关联成像过程中成像物体的透射面积和可见度之间的关系。在鬼衍射和鬼成像系统中，可见度和透射面积之间的关系是完全相反的。为了解释这种互补关系，提出了用像平面的独立次波数来评价成像质量。利用这个概念，两个系统中可见度都随像面有效面积的增大而减小。 2. 研究了参考臂中处于不同位置的物体的双光子关联成像性质。结果发现：探测臂中移动物体使其远离光源的过程中，所得到的像的可见度有明显的提高；同时，得到清晰的像所需要的样本数减小了。这一结果对实际的试验操作很有帮助。 3. 给出了伴随纠缠源的双光子关联成像系统中量子噪声的理论分析。噪声受光源的尺度和纠缠度的影响：当光源的尺度远小于所用透镜的孔径时，光源尺度的增加会导致噪声振幅的显著减小；这个尺寸接近于孔径时，噪声反而几乎没有变化。在纠缠源和经典热源的双光子关联成像中，比较了光源对噪声的影响。 4. 首次给出了利用三阶关联来实现经典非相干光的鬼成像理论。利用这个理论，可以在两个不同的位置同时观察到物体的像。通过对三阶关联函数的分解，讨论了每一个关联部分对鬼成像过程的影响，并与通常的二阶关联鬼成像作了比较。
英文摘要	Two-photon correlated imaging (Ghost imaging), has been the frontier of the cross research of Quantum Information and Imaging Optics in recent years. The research findings of two-photon correlated imaging not only propel the development of Quantum Optics and Imaging Optics but also have led to applications ranging from nanotechnology, biotechnology, to high-energy physics and other regions. Comparing with the wave optics of Imaging Optics, the theory of two-photon correlated imaging has not been perfect because of the short development time. In this thesis, the properties of two- and multi-photon correlated imaging are pursued in detail. The main results are listed as follows: 1. We discuss the relation between the transmissive area of the object imaged and the visibility of its image during of two-photon correlated imaging. For ghost di®raction and ghost imaging systems, the relation between the visibility and the transmissive area is completely opposite. In order to explain this duality, the number of independent sub light sources on the imaging plane is proposed to evaluate the imaging quality. Using this concept, the visibility will decrease when the effective area of the imaging plane is increased for both systems. 2. Two-photon correlated imaging properties of a double-slit located at different positions are investigated in a lensless system with incoherent source. The visibility will present a remarkable enhancement when the object is moved far away from the source. At the same time, the independent sample number used to obtain a clear Fourier-transform image is decreased, which may be helpful for the practical experiment implementation. 3. The theoretical analysis of quantum noise is presented in a two-photon correlated imaging system with entangled photons. The noise is strongly in°uenced by the size and the entanglement degree of the source. An increase of the source size results in a remarkable decrease of the amplitude of the noise when the size is much smaller than the aperture of the lens, whereas the change will be not obvious if the size is closed to the aperture. The difference of the e®ects from the source between two-photon correlated imaging formed with entangled photons and with partially coherent light is also discussed. 4. Ghost imaging theory with classical incoherent light by third-order correlation is presented firstly. It is shown that the spatial information of an object can be reproduced at two different places by means of a third-order correlated imaging process. The effect from each correlation part of the third-order correlation function on the imaging process is investigated, and the similarities and the differences between ghost imaging by third-order correlation and by second-order correlation are also discussed.
语种	中文
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/15383]
专题	上海光学精密机械研究所_学位论文
推荐引用方式 GB/T 7714	白艳锋. 双光子及多光子关联成像性质的理论研究[D]. 中国科学院上海光学精密机械研究所. 2008.

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