Optical transmission matrix measurement sampled on a dense hexagonal lattice

TL;DR

This paper introduces a novel experimental method for measuring the optical transmission matrix of a slab sample using dense hexagonal sampling at the Rayleigh criterion, improving efficiency and reducing distortion.

Contribution

The paper presents a new sampling technique on a hexagonal lattice for TM measurement that minimizes oversampling and crosstalk, enhancing accuracy and efficiency.

Findings

Efficient measurement of a large fraction of the TM

Reduced sampling crosstalk and distortion

Demonstration on a clear reference sample

Abstract

The optical transmission matrix (TM) characterizes the transmission properties of a sample. We show a novel experimental procedure for measuring the TM of light waves in a slab geometry based on sampling the light field on a hexagonal lattice at the Rayleigh criterion. Our method enables the efficient measurement of a large fraction of the complete TM without oversampling while minimizing sampling crosstalk and the associated distortion of the statistics of the matrix elements. The procedure and analysis described here is demonstrated on a clear sample which serves as an important reference for other systems and geometries such as dense scattering media.