Abstract
Several phenomena have been recently exploited to circumvent scattering and have succeeded in imaging or focusing light through turbid layers. However, the requirement for the turbid medium to be steady during the imaging process remains a fundamental limitation of these methods. Here we introduce an optical imaging modality that overcomes this challenge by taking advantage of the so-called shower-curtain effect, adapted to the spatial-frequency domain via speckle correlography. We present high resolution imaging of objects hidden behind millimeter-thick tissue or dense lens cataracts. We demonstrate our imaging technique to be insensitive to rapid medium movements (> 5 m/s) beyond any biologically-relevant motion. Furthermore, we show this method can be extended to several contrast mechanisms and imaging configurations.
Highlights
All-optical imaging through scattering turbid media is among the biggest challenges in optics and has important applications in many biomedical and engineering fields [1]
We present an all-optical method based on the so-called “showercurtain” effect, which enables imaging behind millimeter-thick tissues and is fundamentally insensitive to turbid medium motions
The spatial correlations between the front side and back side of the turbid medium that are exploited in the shower-curtain effect can be considered as the near-field counterpart of the spatial correlations exploited in memory effect protocols (Fig. S2, Supplement 1) [17]; working in an imaging configuration, the near-field correlations exploited in the shower-curtain effect can be made robust against turbid medium motions (Fig. S3, Supplement 1)
Summary
All-optical imaging through scattering turbid media is among the biggest challenges in optics and has important applications in many biomedical and engineering fields [1]. At short distances, the cutoff frequency is high enough that objects can be seen at high resolution even through a turbid medium of several scattering lengths (Fig. S1, Supplement 1).
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