How can we control the handedness of electromagnetic waves propagating through complex media? The broader project in which this internship proposal is embedded addresses this question by investigating how interactions between dielectric scatterers can preserve or modify electromagnetic helicity. The internship will combine microwave experiments and numerical modeling. Using a set of dielectric spheres available in our laboratory, the student will first characterize their electromagnetic response and develop an experimental protocol to measure helicity. This will require reconstructing the relevant electric and magnetic field components, including their relative phases, using microwave antennas. The protocol will then be tested on isolated spheres and configurations of two or a few coupled spheres to investigate how collective interactions affect helicity conversion. In parallel, the student will develop or use numerical models based on coupled electric and magnetic dipoles, and compare theoretical predictions with experimental measurements. A one-month research stay with our Brazilian partner is envisaged, offering the opportunity to learn complementary theoretical and computational techniques. This internship provides hands-on experience in experimental physics, scientific programming and electromagnetic wave physics, while contributing to the development of new experimental methods for studying wave transport in complex media.