On one dimensional inverse problems arising from polarimetric measurements of nematic liquid crystals

TL;DR

This paper analyzes one-dimensional inverse problems related to polarimetric measurements of nematic liquid crystals, demonstrating limitations in reconstructing dielectric parameters and providing a uniqueness result under certain conditions.

Contribution

It simplifies the inverse problem analysis for nematic liquid crystals and establishes a uniqueness condition for reconstructing dielectric parameters with monotonicity.

Findings

Little can be recovered about internal dielectric configurations

A uniqueness result is proved for monotonic dielectric parameters

Data can be expressed via Laplace and Hankel transforms

Abstract

We revisit the problem of determining dielectric parameters in layered nematic liquid crystals from polarimetric measurements originally introduced by Lionheart & Newton. After a detailed analysis of the model, of the scales involved, and of natural obstacles to the reconstruction of more than one dielectric parameters, we produce two simple one-dimensional inverse problems which can be studied without any expertise in liquid crystals. We then confirm that very little can be recovered about the internal configuration of smooth dielectric parameters from these measurements, and give a uniqueness result for one of the two problem, when the unknown parameter satisfies a monotonicity property. In that case, the available data can be expressed in terms of Laplace and Hankel transforms.