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Title

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

Authors
Forcherio, Gregory T.
Dunklin, Jeremy R.
Dantec, Ronan Le
Roper, D. Keith
Published in Optics Letters. 2017, vol. 42, no. 23, p. 5018
Abstract 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 𝝌(2)𝒙𝒙𝒙 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.
Keywords Nonlinear optics2D materials
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Research group Groupe Wolf
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FORCHERIO, Gregory T. et al. Nonlinear optical susceptibility of two-dimensional WS2 measured by hyper Rayleigh scattering. In: Optics Letters, 2017, vol. 42, n° 23, p. 5018. https://archive-ouverte.unige.ch/unige:99961

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Deposited on : 2017-12-05

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