Journal
SCIENTIFIC REPORTS
Volume 8, Issue -, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/s41598-018-28374-1
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Funding
- NGS
- National Research Foundation of Singapore (NRF) [NRF-NRFF2011-02]
- Ministry of Education of Singapore (AcRF Tier 2) [MOE2015-T2-2-123]
- Ministry of Education of Singapore (FRC AcRF Tier 1) [R-144-000-386-114]
- CA2DM through National Research Foundation of Singapore (NRF-CRP Grant) [R-144-000-295-281]
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We report the first detailed characterization of the sheet third-harmonic optical susceptibility,chi((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 vertical bar chi((3))(s)vertical bar approximate to 0.9 x 10(-28) m(3) V-2 at a fundamental excitation frequency of h omega = 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 vertical bar chi((2))(s)vertical bar approximate to 0.7 x 10(-19) m(2) V-1 in very good agreement on the order of magnitude with recent reports for WSe2, which asserts the robustness of our values for vertical bar chi((3))(s)vertical bar .
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