Implement guided balanced polarimetry on chip

Establish whether balanced polarimetry techniques that resolve degree-scale magneto-optic rotations in free-space experiments can be implemented with guided optical components on the Si3N4 waveguide platform.

Background

The calculations predict Faraday and Kerr rotations large enough to be measurable with conventional balanced or lock-in methods. However, the simulated device does not include a fabricated analyzer, polarization splitter, balanced detector, or reference arm. The unresolved issue is whether the free-space measurement architecture can be transferred to an integrated guided-wave implementation without losing the predicted magnetic contrast.

References

What is in question is whether those techniques transfer from a free-space bench to a chip, where analyser, splitter, and reference arm must themselves become guided components.

— Self-consistent modelling of all-optical switching and magneto-optic readout in an integrated Si$_3$N$_4$/GdFeCo waveguide  (2608.22969 - Mulyana et al., 24 Aug 2026) in Section 4, subsection “Readout-suppression hierarchy”