Femtosecond Self-Reconfiguration of Laser-Induced Plasma Patterns in Dielectrics

Abstract

Laser-induced modification of transparent solids by intense femtosecond laser pulses allows fast integration of nanophotonic and nanofluidic devices with controlled optical properties. So far, the local and dynamic nature of the interactions between plasma and light needed to correctly explain nanograting fabrication on dielectric surfaces has been missing in the theoretical models. With our numerical approach, we show that a self-consistent dynamic treatment of the plasma formation and its interaction with light triggers an ultrafast reconfiguration of the periodic plasma patterns on a field-cycle time scale. Within this framework, a simple stability analysis of the local interactions explains how the laser-induced plasma patterns change their orientation with respect to the incident light polarization, when a certain energy density threshold is reached. Moreover, the reconfigured sub-wavelength plasma structures grow into the bulk of the sample and agree with the experimental findings of self-organized volume nanogratings. Mode coupling of the incident and transversally scattered light with the periodic plasma structures is sufficient to initiate the growth and the self-organization of the characteristic pattern with a periodicity of a half-wavelength in the medium.

8 pages, 7 figures

References in corpus (1)

• Saturable Lorentz model for fully explicit three-dimensional modeling of nonlinear optics

Cited by in corpus (4)

• Delayed-rate equations model for femtosecond laser-induced breakdown in dielectrics
• Probing laser-driven structure formation at extreme scales in space and time
• Femtosecond LIPSS on indium-tin-oxide thin films at IR wavelengths
• A Fully Three-Dimensional Kinetic Particle-In-Cell Framework for Modeling Laser-Dielectric Interactions: Few-Cycle Pulse Damage