Mechanism of laser-induced void array formation in fused silica

This study investigates the mechanism of multi-void formation in fused silica using high resolution 3D Finite-Difference-Time-Domain (FDTD) simulations. Despite extensive research dedicated to understanding the mechanisms behind multi-void formation in dielectrics, the fundamental aspects and mechanisms governing self-void array formation remain poorly understood. We modeled the voids as concentric spheres with densified shells and implemented the pre-recorded void(s) in the bulk of fused silica. By studying the laser interaction with the implemented void(s), we observed electric field enhancement in front of the void(s), resulting in the generation of subsequent void. Our study shows that void array formation in fused silica follows a linear mechanism. This study provides valuable insight into the mechanism behind the Void array formation in fused silica.