Magneto-optical imaging technique for hostile environment: the ghost imaging approach

TL;DR

This paper introduces a novel magneto-optical imaging method using ghost imaging to visualize magnetic domains in extreme environments where traditional imaging fails.

Contribution

It pioneers the application of ghost imaging protocol in magneto-optical microscopy, enabling imaging under harsh conditions like cryogenic temperatures and high magnetic fields.

Findings

Successful imaging of magnetic domains in yttrium iron garnet sample

Separation of optical paths improves imaging in hostile environments

Correlations in thermal light enable domain image retrieval

Abstract

We develop a new approach in magneto-optical imaging (MOI), applying for the first time a ghost imaging (GI) protocol to perform Faraday microscopy. MOI is of the utmost importance for the investigation of magnetic properties of material samples, through Weiss domains shape, dimension and dynamics analysis. Nevertheless, in some extreme conditions such as e. g. cryogenic temperatures or high magnetic fields application, there exists a lack of domains images due to the difficulty in creating an efficient imaging system in such environments. Here we present an innovative MOI technique that separates the imaging optical path from the one illuminating the object. The technique is based on thermal light GI and exploits correlations between light beams to retrieve the image of magnetic domains. As a proof of principle, the proposed technique is applied to the Faraday magneto-optical observation of the remanence domain structure of an yttrium iron garnet sample.