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Laser-assisted tunable optical nonlinearity in liquid-phase exfoliated MoS2 dispersion

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Abstract

The paper aims to explain the effect of laser irradiation on the nonlinear optical (NLO) response of MoS2 nanosheets. MoS2-layered nanostructures were prepared by liquid-phase exfoliation (LPE) in deionized (DI) water. The characterization of MoS2 dispersion proves the formation of 2-3-layered 2H-MoS2 nanosheets with less than 100 nm lateral dimension. The NLO response of prepared dispersion was explored using the Z-scan technique with 532 nm continuous wave (CW) laser beam at 30, 50, 70 mW powers. The main finding of this research is that the nonlinear refractive index (n2) of MoS2 dispersion is a laser-assisted tunable quantity. It has been shown that the nonlinear refractive index of MoS2 nanosheets is altered up to 48% of its initial value only by 1-h laser irradiation with 30 mW power.

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Acknowledgements

The authors would like to thank Dr. B. M. Szydlowska for her valuable comments.

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Authors and Affiliations

  1. Department of Physics, Shahid Beheshti University, Tehran, 1983969411, Iran

    Sara Ghayeb Zamharir & Rouhollah Karimzadeh

  2. Condensed Matter National Laboratory, Institute for Research in Fundamental Sciences (IPM), Tehran, 193955531, Iran

    Seyed Hamed Aboutalebi

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  1. Sara Ghayeb Zamharir
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  2. Rouhollah Karimzadeh
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Correspondence to Rouhollah Karimzadeh.

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Ghayeb Zamharir, S., Karimzadeh, R. & Aboutalebi, S.H. Laser-assisted tunable optical nonlinearity in liquid-phase exfoliated MoS2 dispersion. Appl. Phys. A 124, 692 (2018). https://doi.org/10.1007/s00339-018-2115-2

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