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The influence of non-imaging detector design on heralded ghost-imaging and ghost-diffraction examined using a triggered ICCD came

机译：非成像探测器设计对使用触发ICCD检测的预测鬼影和鬼影衍射的影响来了

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摘要

Ghost imaging and ghost diffraction can be realized by using the spatial correlations between signal and idler photons produced by spontaneous parametric down-conversion. If an object is placed in the signal (idler) path, the spatial correlations between the transmitted photons as measured by a single, non-imaging, “bucket” detector and a scanning detector placed in the idler (signal) path can reveal either the image or diffraction pattern of the object, whereas neither detector signal on its own can. The details of the bucket detector, such as its collection area and numerical aperture, set the number of transverse modes supported by the system. For ghost imaging these details are less important, affecting mostly the sampling time required to produce the image. For ghost diffraction, however, the bucket detector must be filtered to a single, spatially coherent mode. We examine this difference in behavour by using either a multi-mode or single-mode fibre to define the detection aperture. Furthermore, instead of a scanning detector we use a heralded camera so that the image or diffraction pattern produced can be measured across the full field of view. The importance of a single mode detection in the observation of ghost diffraction is equivalent to the need within a classical diffraction experiment to illuminate the aperture with a spatially coherent mode.
机译：鬼影成像和重影衍射可以通过使用自发参数下转换产生的信号和惰轮光子之间的空间相关性来实现。如果将物体放置在信号（惰轮）路径中，则由单个非成像“桶”检测器和放置在惰轮（信号）路径中的扫描检测器测量的透射光子之间的空间相关性可以显示出物体的图像或衍射图样，而检测器自身都不能发出信号。铲斗检测器的详细信息（例如其收集区域和数值孔径）可设置系统支持的横向模式的数量。对于重影成像，这些细节不太重要，主要影响产生图像所需的采样时间。但是，对于重影衍射，必须将桶形检测器过滤到单个空间相干模式。我们通过使用多模或单模光纤定义检测孔径来检查行为上的差异。此外，我们使用带罩摄像机代替扫描探测器，以便可以在整个视场上测量产生的图像或衍射图样。单模检测在重影衍射观察中的重要性等同于经典衍射实验中以空间相干模式照亮孔径的需求。

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