Lanthanide-doped nanoparticles exhibit unique optical properties, making them highly relevant for advanced applications such as thermometry, biological sensing, and solid-state laser cooling. In particular, research has shown that for single doped nanoparticles these optical properties are influenced by many factors such as size and dopant concentration.

In this work, we present the experimental implementation of an optical system for Stokes thermometry on single nanoparticles deposited on a substrate. This system allows for the study of the relationship between the emission spectrum and the temperature of the nanoparticles, contributing to a deeper understanding of their thermal and optical properties. The experimental setup focuses a beam on the sample using a microscopy system, and collects the light scattered by single lanthanide-doped nanoparticles.

We will present the results obtained from the experimental implementation of the described system, including emission spectra of single nanoparticles, from which we derive the thermal behaviour of the nanoparticles.