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Title: Characterization of the second- and third-harmonic optical susceptibilities of atomically thin tungsten diselenide
Authors: Rosa H.G. 
Ho Y.W.
Verzhbitskiy I. 
Rodrigues M.J.F.L. 
Taniguchi T.
Watanabe K.
Eda G. 
Pereira V.M. 
Gomes J.C.V. 
Issue Date: 2018
Publisher: Nature Publishing Group
Citation: Rosa H.G., Ho Y.W., Verzhbitskiy I., Rodrigues M.J.F.L., Taniguchi T., Watanabe K., Eda G., Pereira V.M., Gomes J.C.V. (2018). Characterization of the second- and third-harmonic optical susceptibilities of atomically thin tungsten diselenide. Scientific Reports 8 (1) : 10035. ScholarBank@NUS Repository.
Abstract: We report the first detailed characterization of the sheet third-harmonic optical susceptibility, ? (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 |? (3) s|? 0.9×10-28m3 V-2 at a fundamental excitation frequency of ? = 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 |? (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 |? (3) s|. © 2018 The Author(s).
Source Title: Scientific Reports
ISSN: 20452322
DOI: 10.1038/s41598-018-28374-1
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