Nonlinear optical susceptibility of two-dimensional WS2 measured by hyper Rayleigh scattering

Hyper Rayleigh scattering (HRS) was used to measure the second-order nonlinear susceptibility, χ(2), for liquid exfoliated WS2 monolayers. To the best of our knowledge, it is the first reported application of the HRS technique to assess the bulk-like χ(2) of a two-dimensional (2D) material. The conc...

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Bibliographic Details
Published in:Optics letters 2017-12, Vol.42 (23), p.5018-5021
Main Authors: cherio, Gregory T, Riporto, Jérémy, Dunklin, Jeremy R, Mugnier, Yannick, Dantec, Ronan Le, Bonacina, Luigi, Roper, D Keith
Format: Article
Language:English
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Summary:Hyper Rayleigh scattering (HRS) was used to measure the second-order nonlinear susceptibility, χ(2), for liquid exfoliated WS2 monolayers. To the best of our knowledge, it is the first reported application of the HRS technique to assess the bulk-like χ(2) of a two-dimensional (2D) material. The concentration-dependent HRS signal indicated a 4.90±0.30×10-25  esu first hyperpolarizability for 42 nm WS2 monolayers under 1064 nm laser irradiation using para-nitroaniline as an external reference. The corresponding value of χxxx(2) was calculated to be 460±28  pm V-1. This was within 46% of independent density functional theory predictions. Agreement with theory was improved over related microscopy-based approaches. These results support the use of HRS to evaluate 2D materials for nonlinear frequency mixing applications.
ISSN:1539-4794
DOI:10.1364/OL.42.005018