Efficient guiding of quantum dot luminescence in CdS-doped phosphate glasses via femtosecond laser-written waveguides

Abstract

We report on the efficient guiding of quantum dot (QD) luminescence in CdS-doped phosphate glasses, enabled by femtosecond laser-written waveguides. Quantum dots are well-known for their tunable optical properties and high quantum efficiency, making them ideal candidates for a wide range of photonic applications. Using ultrashort laser pulses, we fabricated buried waveguides with positive refractive index changes that successfully guided the luminescence emitted by QDs through the glass matrix. Single-track waveguides demonstrated Gaussian output beam profiles at 405 nm, while multi-track waveguides reduced optical losses and enhanced light propagation. These findings highlight the potential for QD luminescence to be effectively confined and guided, making femtosecond laser-written structures a powerful tool in developing QD-based devices. The ability to guide QD luminescence opens new pathways for applications in photonic circuits, displays, solid-state lasers, and solar energy systems, demonstrating the versatile role of QDs in integrated optical technologies.