Extraordinary Second Harmonic Generation in Tungsten Disulfide Monolayers View Full Text


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Article Info

DATE

2015-05

AUTHORS

Corey Janisch, Yuanxi Wang, Ding Ma, Nikhil Mehta, Ana Laura Elías, Néstor Perea-López, Mauricio Terrones, Vincent Crespi, Zhiwen Liu

ABSTRACT

We investigate Second Harmonic Generation (SHG) in monolayer WS₂ both deposited on a SiO₂/Si substrate or suspended using transmission electron microscopy grids. We find unusually large second order nonlinear susceptibility, with an estimated value of d(eff) ~ 4.5 nm/V nearly three orders of magnitude larger than other common nonlinear crystals. In order to quantitatively characterize the nonlinear susceptibility of two-dimensional (2D) materials, we have developed a formalism to model SHG based on the Green's function with a 2D nonlinear sheet source. In addition, polarized SHG is demonstrated as a useful method to probe the structural symmetry and crystal orientation of 2D materials. To understand the large second order nonlinear susceptibility of monolayer WS₂, density functional theory based calculation is performed. Our analysis suggests the origin of the large nonlinear susceptibility in resonance enhancement and a large joint density of states, and yields an estimate of the nonlinear susceptibility value d(eff) = 0.77 nm/V for monolayer WS₂, which shows good order-of-magnitude agreement with the experimental result. More... »

PAGES

5530

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/srep05530

DOI

http://dx.doi.org/10.1038/srep05530

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1017348207

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/24984953


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