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dc.contributor.authorRosa, Henrique G.por
dc.contributor.authorHo, Yi Weipor
dc.contributor.authorVerzhbitskiy, Ivanpor
dc.contributor.authorRodrigues, Manuel José Lima Ferreirapor
dc.contributor.authorTaniguchi, Takashipor
dc.contributor.authorWatanabe, Kenjipor
dc.contributor.authorEda, Gokipor
dc.contributor.authorPereira, Vitor M.por
dc.contributor.authorGomes, José C. V.por
dc.descriptionSupplementary information accompanies this paper at
dc.description.abstractWe 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|.por
dc.description.sponsorshipY.W.H. acknowledges scholarship support from NGS. G.E. acknowledges financial support from National Research Foundation of Singapore (NRF Research Fellowship NRF-NRFF2011-02 and medium-sized centre programme) and Ministry of Education of Singapore (AcRF Tier 2 MOE2015-T2-2-123). V. M. P. acknowledges fnancial support from Ministry of Education of Singapore (FRC AcRF Tier 1 R-144-000-386-114). J.C.V.G. acknowledges fnancial support from CA2DM through National Research Foundation of Singapore (NRF-CRP Grant No. R-144-000-295-281).por
dc.publisherNature Researchpor
dc.titleCharacterization of the second- and third-harmonic optical susceptibilities of atomically thin tungsten diselenidepor
dc.subject.wosScience & Technologypor
sdum.journalScientific Reportspor
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