Terahertz harmonic generation from graphite pencil drawings
Terahertz harmonic generation from graphite pencil drawings
Arshad, A.; Koyun, H. N.; Salikhov, R.; Gensch, M.; Ilyakov, I.; Ponomaryov, O.; Prajapati, G. L.; Mavridou, K.; Lindner, J.; Deinert, J.-C.; Ünlü, C.; de Oliveira, T.; Kovalev, S.
We study the third harmonic generation (THG) of graphite layers on paper substrate upon excitation with intense (up to 100 kV/cm) narrowband terahertz (THz) pulses. Highest THG efficiencies are comparable with those of CVD-grown single-layer graphene. Samples were hand-drawn, using commercially available pencils. The THG response showed a high sensitivity regarding the hatching direction relative to the THz polarization orientation. Using Raman spectroscopy, we confirmed the occurrence of graphene-like structures in the samples. Our findings demonstrate the feasibility of virtually no cost and easy to fabricate materials for THz nonlinear optics.
Keywords: Graphite; terahertz harmonic generation; Dirac materials; nonlinear terahertz optics; Raman Spectroscopy
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Advanced Photonics Research 4(2023)7, 2300088
Online First (2023) DOI: 10.1002/adpr.202300088
Permalink: https://www.hzdr.de/publications/Publ-36523