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

作者：Forcherio Gregory T; Riporto Jeremy; Dunklin Jeremy R; Mugnier Yannick; Le Dantec Ronan; Bonacina Luigi; Roper D Keith^*

来源：Optics Letters, 2017, 42(23): 5018-5021.

DOI：10.1364/OL.42.005018

Hyper Rayleigh scattering (HRS) was used to measure the second-order nonlinear susceptibility, chi((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 chi((2)) of a two-dimensional (2D) material. The concentration-dependent HRS signal indicated a 4.90 +/- 0.30 x 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 chi((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.

• 出版日期2017-12-1