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Characterization of the second- and third-harmonic optical susceptibilities of atomically thin tungsten diselenide

2018; Nature Portfolio; Volume: 8; Issue: 1 Linguagem: Inglês

10.1038/s41598-018-28374-1

2045-2322

Henrique G. Rosa, Yi Wei Ho, Ivan Verzhbitskiy, Manuel J. F. L. Rodrigues, Takashi Taniguchi, Kenji Watanabe, Goki Eda, Vitor M. Pereira, José Viana‐Gomes,

Chalcogenide Semiconductor Thin Films

We report the first detailed characterization of the sheet third-harmonic optical susceptibility, χ(3)s, of tungsten diselenide (WSe2). With a home-built multiphoton microscope setup developed to study harmonics generation, we map the second and third-harmonic intensities as a function of position in the sample, pump power and polarization angle, for single- and few-layers flakes of WSe2. We register a value of |χ(3)s| ≈ 0.9 × 10-28 m3 V-2 at a fundamental excitation frequency of ℏω = 0.8 eV, which is comparable in magnitude to the third-harmonic susceptibility of other group-VI transition metal dichalcogenides. The simultaneously recorded sheet second-harmonic susceptibility is found to be |χ(2)s| ≈ 0.7 × 10-19 m2 V-1 in very good agreement on the order of magnitude with recent reports for WSe2, which asserts the robustness of our values for |χ(3)s|.