PhD Defense by Jonas B. Mathiassen

The Light Atom Quantum Simulator experiment constitutes a hybrid platform that integrates arrays of ultracold, optically trapped neutral atoms with two-dimensional photonic crystal waveguide structures. The photonic crystal's proximity to the atoms enables engineered interactions between the atoms. This thesis focuses on the design and fabrication of suspended silicon nitride (Si₃N₄) photonic devices tailored for this experiment. It explores the constraints imposed by the atomic system's requirements, presents the fabrication methodology, and details preliminary optical characterization of the devices.