SAMOP 2023 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 30: Nano-optics
Q 30.4: Talk
Wednesday, March 8, 2023, 11:45–12:00, F442
Nonlinear response in nanostructured multilayers — •Navid Daryakar1 and Christin David2 — 1Institute of Condensed Matter Theory and Optics, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany — 2Institute of Condensed Matter Theory and Optics, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany
We studied the nonlinear optical response of composite nanostructured layers in terms of a self-phase-modulated, third-order Kerr nonlinearity. Theoretical modeling is considered through effective medium theories (Maxwell-Garnett, Bruggeman) to identify the behavior of the composite nanostructures in linear and nonlinear regimes. The optical response is modified and the dependence on various system parameters such as fill fraction, layer thickness and width, diffraction orders and laser intensity is studied. We thus show at which intensity transitioning to the nonlinear regime occurs, and how material response changes can be conveniently used as a signature of the transition. Our finding is general, and the method can be applied to any material mixture of thin films. As such, we expect our results to enable future studies aimed at predicting nonlinear optical response of composite nanostructures on the nanoscale. Nonlinear effective medium theory is used to describe low densities of gold nanoparticles embedded in an equally nonlinear host material. The fill fraction strongly influences the effective nonlinear susceptibility of the materials increasing it by orders of magnitude in case of gold due to localized surface plasmonic resonances.