SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 64: Poster: Graphene

O 64.7: Poster

Mittwoch, 29. März 2023, 18:00–20:00, P2/EG

Terahertz harmonic generation from graphite pencil drawings — •Atiqa Arshad, Segey Kovalev, and Jan Christoph — Helmoltz Zentrum Dresden (HZDR)

Harmonic generation is a general characteristic of driven nonlinear systems. It can serve as an efficient tool for investigating the fundamental principles that govern the underlying ultrafast nonlinear dynamics. Here we report on terahertz third harmonic generation (THG) from graphite pencil drawings on paper. We demonstrate that the terahertz(THz)-THG efficiency at an excitation frequency of 0.5 THz in graphite is comparable to that of single-layer graphene pump field strengths on the order of 100 kV/cm-1. The THG efficiency in graphite exhibits a significantly less pronounced saturation behavior at high incident fields and thus may even surpass that of graphene at extreme pump field strengths. The less pronounced saturation can be attributed to more efficient heat dissipation in multilayer graphite flakes compared to single-layer graphene. The feasibility of using easy-to-produce graphite-based structures opens up new possibilities for highly accessible, modifiable, and nearly cost-free THz frequency multipliers. Besides the implementation of graphite-based THz frequency converters, the developed technique could be used for nonlinear THz imaging, offering the possibility to image graphite drawings covered by other materials.