Higher-order ghost imaging with partially polarized classical light
Higher-order ghost imaging with partially polarized classical light
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DOI：
10.1117/12.896826
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发表时间：
2011-09
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影响因子：
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通讯作者：
H. Kellock;T. Setälä;T. Shirai;A. Friberg
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文献类型：
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作者：
H. Kellock;T. Setälä;T. Shirai;A. Friberg
可见度、信噪比(SNR)和对比度噪声比(CNR)是在重影(或相关)成像中表征图像质量的量。利用标量光进行量子和经典鬼像成像时，可见度随着成像阶数的增加而提高。最近，电磁鬼影成像也开始引起人们的注意。在这项工作中，我们分析了成像顺序和照明的偏振度(P)对图像质量参数的影响。源是服从高斯统计的经典的、部分极化的随机电磁场。光束被分成几(N)个部分，这些部分被引导到物体或参考臂中，并且计算相关的强度相关性。当N>；2时，可能存在多个对背景有贡献的参考臂。我们考虑了能见度的两种不同定义，以及SNR和CNR，并考察了它们在二阶和高阶重影成像中可达到的极限值作为偏振度的函数。能见度的两种表达方式相似；它们随着成像的顺序和偏振度的增加而增加。在二阶成像中，由于噪声的增加，随着P的增加，SNR降低，而CNR基本保持不变。我们强调，准确的数值取决于所使用的定义和设置中的目标臂数量。
Visibility, signal-to-noise ratio (SNR), and contrast-to-noise ratio (CNR) are quantities that characterize the quality of the image in ghost (or correlation) imaging. The visibility in quantum and classical ghost imaging with scalar light is known to improve as the order of imaging increases. Recently also electromagnetic ghost imaging has started to attract attention. In this work we analyze the effects of both the order of imaging and the degree of polarization (P) of the illumination on the image quality parameters. The source is a classical, partially polarized, random electromagnetic field obeying Gaussian statistics. The beam is split into several (N) parts which are directed either into the object or reference arms and the associated intensity correlations are calculated. When N > 2, more than one reference arm may exist which contributes to the background. We consider two different definitions for the visibility, as well as the SNR and CNR, and examine their attainable limiting values in second- and higher-order ghost imaging as a function of the degree of polarization. Both expressions of the visibility behave in a similar manner; they increase with the order of imaging and the degree of polarization. In second-order imaging the SNR decreases, due to increased noise, as P increases, while the CNR remains essentially constant. We emphasize that the exact numerical values depend on the definitions used and on the number of object arms in the setup.