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TitleCharacterization of the second- and third-harmonic optical susceptibilities of atomically thin tungsten diselenide
Author(s)Rosa, Henrique G.
Ho, Yi Wei
Verzhbitskiy, Ivan
Rodrigues, Manuel José Lima Ferreira
Taniguchi, Takashi
Watanabe, Kenji
Eda, Goki
Pereira, Vitor M.
Gomes, José C. V.
Issue date3-Jul-2018
PublisherNature Research
JournalScientific Reports
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|.
DescriptionSupplementary information accompanies this paper at
AccessOpen access
Appears in Collections:CDF - OCV - Artigos/Papers (with refereeing)

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