Second harmonic microscopy of monolayer MoS 2

By Nardeep Kumar, S. Najmaei, Q. Cui, F. Ceballos, Pulickel M. Ajayan, J. Lou, Hui Zhao. 2013

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We show that the lack of inversion symmetry in monolayer MoS2 allows strong optical second harmonic generation. Second harmonic of an 810-nm pulse is generated in a mechanically exfoliated monolayer, with a nonlinear susceptibility on the order of 1E-7 m/V. The susceptibility reduces by a factor of seven in trilayers, and by about two orders of magnitude in even layers. A proof-of-principle second harmonic microscopy measurement is performed on samples grown by chemical vapor deposition, which illustrates potential applications of this effect in fast and non-invasive detection of crystalline orientation, thickness uniformity, layer stacking, and single-crystal domain size of atomically thin films of MoS2 and similar materials.

Subfields: Biomedical Engineering, Materials Chemistry, Molecular Biology

View Paper: https://www.semanticscholar.org/paper/7fd19745352671d601dfc57668763313d0d51867

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In Materials Chemistry

1. Edmund J. R. Kelleher
2. R. I. Woodward
3. F. Torrisi
4. E. Malic
5. G. Hu
6. R. Howe
7. Meng Zhang
8. Tawfique Hasan