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27 April 2016 Reversibility of scattered fields (Conference Presentation)
Renjie Zhou, Taewoo Kim, Gabriel Popescu
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Proceedings Volume 9718, Quantitative Phase Imaging II; 97180E (2016) https://doi.org/10.1117/12.2216388
Event: SPIE BiOS, 2016, San Francisco, California, United States
Abstract
In recent years, tremendous efforts have been spent on deep tissue imaging using phase conjugation, a technique used to undo the effects of light scattering in a thick tissue. Despite the early debates between Yariv and Wolf, it is still not well understood physically how deep can a field propagate into biological tissue and still be phase conjugated. In order to answer this question, we developed a light scattering theory to describe the evolution of the phase associated with a field scattered by a thick tissue block. The multiple scattering through the sample is simplified to a series of single scattering through consecutive thin tissue slices. With this theory, we identify the limits of the phase conjugation operation and recover the previous results by Yariv and Wolf, which asserts that phase conjugation is rooted in small angle approximation. Importantly, we discover the fundamental principle that rules phase conjugation: the mean axial wavenumber of a field progressively decreases to zero as it scatters multiple times. At this point, phase becomes a spatially random variable and phase conjugation becomes impossible. This result describes a fundamental phenomenon: the interaction between a deterministic object and a deterministic field can result in a random scattered field. We show that this phenomenon is rooted into Heisenberg’s uncertainty principle.
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View presentation recording on the SPIE Digital Library: http://dx.doi.org/10.1117/12.2216388.4848767810001
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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Renjie Zhou, Taewoo Kim, and Gabriel Popescu "Reversibility of scattered fields (Conference Presentation)", Proc. SPIE 9718, Quantitative Phase Imaging II, 97180E (27 April 2016); https://doi.org/10.1117/12.2216388
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KEYWORDS
Phase conjugation
Light scattering
Tissue optics
Tissues
Deep tissue imaging
Multiple scattering
Scattering
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