Reconstructing complex field through opaque scattering layer with structured light illumination

TL;DR

This paper introduces a reference-free structured light illumination method to reconstruct complex optical fields through opaque scattering layers, enabling imaging of complex objects despite wavefront scrambling.

Contribution

It presents a novel technique combining phase-shifting structured illumination and speckle correlation to recover complex fields without a reference beam.

Findings

Successful reconstruction of complex objects through scattering media

Demonstrated effectiveness via experimental and simulated results

Applicable to imaging in turbid or opaque environments

Abstract

The wavefront is scrambled when coherent light propagates through a random scattering medium and which makes direct use of the conventional optical methods ineffective. In this paper, we propose and demonstrate a structured light illumination for imaging through an opaque scattering layer. Proposed technique is reference free and capable to recover the complex field from intensities of the speckle patterns. This is realized by making use of the phase-shifting in the structured light illumination and applying spatial averaging of the speckle pattern in the intensity correlation measurement. An experimental design is presented and simulated results based on the experimental design are shown to demonstrate imaging of different complex-valued objects through scattering layer.