Depth-Resolved Speckle-Correlations Imaging through Scattering Layers

TL;DR

This paper introduces a method combining speckle-correlation imaging with coherence-gating to achieve high-resolution depth sectioning of hidden objects through scattering layers, overcoming previous limitations.

Contribution

It extends speckle-correlation imaging to include depth-resolved imaging in reflection mode using coherence-gating, enabling 3D imaging through scattering layers.

Findings

Successful depth measurements of hidden targets through scattering layers

Demonstration of speckle-correlation imaging with coherence-gated scattered light

Enhanced imaging capabilities beyond the angular and axial range of the memory effect

Abstract

Recently, novel imaging techniques based on the 'memory-effect' speckle-correlations have enabled diffraction-limited imaging through scattering layers and around corners. These techniques, however, are currently limited to imaging only small planar objects that are contained within the angular and axial range of the memory effect. In addition, they do not provide depth information or depth sectioning capability. Here, we extend speckle-correlation imaging to include high-resolution depth-sectioning capability in reflection-mode, by combining it with coherence-gating via low coherence holography. We demonstrate depth measurements of hidden targets through a scattering layer, and speckle-correlation imaging using coherence-gated scattered light.