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|Title:||Characterization of the second- and third-harmonic optical susceptibilities of atomically thin tungsten diselenide|
|Author(s):||Rosa, Henrique G.|
Ho, Yi Wei
Rodrigues, Manuel José Lima Ferreira
Pereira, Vitor M.
Gomes, José C. V.
|Abstract(s):||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|.|
|Description:||Supplementary information accompanies this paper at https://doi.org/10.1038/s41598-018-28374-1|
|Appears in Collections:||CDF - OCV - Artigos/Papers (with refereeing)|