Research Area: Femtosecond Laser Writing

The Problem

Photonics circuits have been traditionally developed using nano-lithographic techniques, which either use lithographic masks or e-beam writing followed by dry-etching methods. Both of these approaches are expensive to be implemented in resource-limited settings, which therefore has hindered photonic innovations in developing countries. We are exploring methods to develop a wet-etching method assisted by laser pulses.

Our Research

Femtosecond Laser Writing (FLW) creates photonic structures by focusing a high-energy femtosecond laser beam to alter a material's refractive index. While FLW is demonstrated, the underlying physical processes are poorly understood. This project aims to develop a physical model for glass densification induced by femtosecond laser radiation, using pump-probe Raman and Brillouin spectroscopy. This model will be crucial for creating reproducible, high-quality photonic components on glass, benefiting photonics applications, especially in developing countries.