Exploiting volumetric wave correlation for enhanced depth imaging in scattering medium

TL;DR

This paper introduces a volumetric imaging method that leverages wave correlation across wavelength and angles to significantly improve depth imaging resolution in scattering media, surpassing traditional 2D approaches.

Contribution

The authors develop a novel 3D reconstruction framework exploiting wave correlations in volumetric data, achieving ultrahigh resolution in complex scattering environments.

Findings

32-fold increase in usable signal waves compared to 2D methods

Achieved lateral resolution of 0.41 μm and axial resolution of 0.60 μm

Demonstrated effective imaging within complex scattering media

Abstract

Imaging an object embedded within a scattering medium requires the correction of complex sample-induced wave distortions. Existing approaches have been designed to resolve them by optimizing signal waves recorded in each 2D image. Here, we present a volumetric image reconstruction framework that merges two fundamental degrees of freedom, the wavelength and propagation angles of light waves, based on the object momentum conservation principle. On this basis, we propose methods for exploiting the correlation of signal waves from volumetric images to better cope with multiple scattering. By constructing experimental systems scanning both wavelength and illumination angle of the light source, we demonstrated a 32-fold increase in the use of signal waves compared with that of existing 2D-based approaches and achieved ultrahigh volumetric resolution (lateral resolution: 0.41 um, axial resolution: 0.60 um) even within complex scattering medium owing to the optimal coherent use of the extremely broad spectral bandwidth (225 nm).