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We report the first detailed characterization of the sheet third-harmonic optical susceptibility, x(3)sheet, of WSe2. 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 x(3)sheet = (1.6 ± 0.2) x10-28 m3 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 second-harmonic susceptibility is found to be x(2)sheet = (2.69 ± 0.07) × 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 x(

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Third-harmonic optical susceptibility, WSe2, multiphoton microscope

Date published: 2018-07-03

Publisher: Springer Science and Business Media LLC

Journal:

• Scientific Reports (ISSN: 20452322) vol. 8 issue. 1

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Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1038/s41598-018-28374-1

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Updated at: 2025-02-23 22:50:34 +0900

Published on MDR: 2025-02-23 22:50:34 +0900