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A: Fachverband Atomphysik

A 3: Interaction with Strong or Short Laser Pulses I (joint session A/MO)

A 3.5: Vortrag

Montag, 6. März 2023, 12:15–12:30, F303

Modeling controlled sub-wavelength plasma formation in dielectrics — •Jonas Apportin, Christian Peltz, Björn Kruse, Benjamin Liewehr, and Thomas Fennel — Institute for Physics, Rostock, Germany

Laser induced damage in dielectrics due to short pulse excitation plays a major role in a variety of scientific and industrial applications, such as the preparation of 3D structured evanescently coupled waveguides [1]. Here the irreversible modifications originate from higher order nonlinearities like strong field ionization and plasma formation. Improving user control over these material modifications, e.g. permanent refractive index modifications, therefore strongly relies on a better understanding of the underlying interaction dynamics, in particular the early phases of interaction. To this end we developed and utilized a numerical model, that combines a local description of the dynamics in terms of corresponding rate equations for ionization, collisions and heating with a fully electromagnetic field propagation via the Finite-Difference-Time-Domain method, adding self-consistent feedback effects like the sudden buildup of plasma mirrors. Here we present first numerical results regarding the creation and control of sub-wavelength gratings formed at the rear side of fused silica films.

[1] D. Blömer et al., Opt. Express 14, 2151-2157 (2006)