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Fabrication and Characterization of Disordered Polymer Optical Fibers for Transverse Anderson Localization of Light

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Signal-reference correlation for modal structure retrieval in disordered optical fields.

Yukti Pandey, Neha Joshi, Raj Kumar

|May 15, 2026

Summary

This summary is machine-generated.

We developed a new method to identify structured light patterns, even after they pass through scattering materials. This technique reveals hidden modal structures in light, simplifying complex optical analysis.

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Area of Science:

Optics and Photonics
Quantum Optics
Information Optics

Background:

Structured light beams like Hermite-Gaussian (HG) and Laguerre-Gaussian (LG) modes lose their spatial information when propagating through scattering media.
Direct intensity measurements of these beams result in randomized speckle patterns, making modal analysis challenging.

Purpose of the Study:

To experimentally demonstrate a novel signal-reference modal correlation method for retrieving structured optical modal signatures.
To overcome the limitations of direct intensity measurements in scattering environments.

Main Methods:

Utilizing a signal-reference modal correlation technique.
Computing the spatial cross-correlation between signal speckle patterns and a fixed Gaussian reference beam.
Analyzing the resulting correlation peaks for modal information.

Main Results:

Distinct modal morphology was recovered in the central correlation peak.
Cartesian parity symmetry was successfully retrieved for HG modes.
Charge-dependent radial scaling was resolved for LG modes.
The method effectively identified structured light despite scattering.

Conclusions:

The signal-reference modal correlation method provides a compact and experimentally accessible framework for structured-light discrimination.
This approach does not require transmission-matrix calibration, wavefront shaping, or machine-learning-assisted reconstruction.
It offers a robust way to analyze light structures in complex scattering environments.