Hyper-Rayleigh scattering in 2D redox exfoliated semi-metallic ZrTe2transition metal dichalcogenide
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Artigo
Date
2020
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Physical Chemistry Chemical Physics
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6
Authors
Da Silva-Neto M.L.
Barbosa-Silva R.
De Araujo C.B.
De Matos C.J.S.
Jawaid A.M.
Ritter A.J.
Vaia R.A.
Gomes A.S.L.
Barbosa-Silva R.
De Araujo C.B.
De Matos C.J.S.
Jawaid A.M.
Ritter A.J.
Vaia R.A.
Gomes A.S.L.
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Abstract
© the Owner Societies.Nonlinear optical characterization of nanostructured layered transition metal dichalcogenides (LTMDs) is of fundamental interest for basic knowledge and applied purposes. In particular, second-order optical nonlinearities are the basis for second harmonic generation as well as sum or difference frequency generation and have been studied in some 2D TMDs, especially in those with a semiconducting character. Here we report, for the first time, on the second-order nonlinearity of the semi-metallic ZrTe2 monolayer in acetonitrile suspension (concentration of 4.9 × 1010 particles per cm3), synthesized via a modified redox exfoliation method and characterized using the Hyper-Rayleigh scattering technique in the nanosecond regime. The orientation-Averaged first-hyperpolarizability was found to be β(2ω) = (7.0 ± 0.3) × 10-24 esu per ZrTe2 monolayer flake, the largest reported so far. Polarization-resolved measurements were performed in the monolayer suspension and indicate the dipolar origin of the generated incoherent second harmonic wave. This journal is
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Keywords
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Difference-frequency generation , First hyperpolarizabilities , Hyper Rayleigh scattering , Layered transition metal dichalcogenides , Non-linear optical , Second harmonic waves , Second order optical nonlinearity , Second-order nonlinearity