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±0.30×1025  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  pmV1. 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.

© 2017 Optical Society of America

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Corrections

Gregory T. Forcherio, Jérémy Riporto, Jeremy R. Dunklin, Yannick Mugnier, Ronan Le Dantec, Luigi Bonacina, and D. Keith Roper, "Nonlinear optical susceptibility of two-dimensional WS2 measured by hyper Rayleigh scattering: erratum," Opt. Lett. 43, 2400-2401 (2018)
https://www.osapublishing.org/ol/abstract.cfm?uri=ol-43-10-2400

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