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Characterization of the second- and third-order nonlinear optical susceptibilities of monolayer MoS2 using multiphoton microscopy

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Title: Characterization of the second- and third-order nonlinear optical susceptibilities of monolayer MoS2 using multiphoton microscopy
Authors: Woodward, RI
Murray, RT
Phelan, CF
De Oliveira, R
Runcorn, T
Kelleher, E
Li, S
De Oliveira, E
Fechine, G
Eda, G
De Matos, CJS
Item Type: Journal Article
Abstract: We report second- and third-harmonic generation in monolayer MoS2 as a tool for imaging and accurately characterizing the material's nonlinear optical properties under 1560 nm excitation. Using a surface nonlinear optics treatment, we derive expressions relating experimental measurements to second- and third-order nonlinear sheet susceptibility magnitudes, obtaining values of $| {\chi }_{{\rm{s}}}^{(2)}| \ =2.0\times {10}^{-20}$ m2 V−1 and, for the first time for monolayer MoS2, $| {\chi }_{{\rm{s}}}^{(3)}| =1.7\times {10}^{-28}$ m3 V−2. These sheet susceptibilities correspond to effective bulk nonlinear susceptibility values of $| {\chi }_{{\rm{b}}}^{(2)}| =2.9\ \times {10}^{-11}$ m V−1 and $| {\chi }_{{\rm{b}}}^{(3)}| =2.4\times {10}^{-19}$ m2 V−2, accounting for the sheet thickness. Experimental comparisons between MoS2 and graphene are also performed, demonstrating ~3.4 times stronger third-order sheet nonlinearity in monolayer MoS2, highlighting the material's potential for nonlinear photonics in the telecommunications C band.
Issue Date: 29-Nov-2016
Date of Acceptance: 28-Oct-2016
URI: http://hdl.handle.net/10044/1/42198
DOI: https://dx.doi.org/10.1088/2053-1583/4/1/011006
ISSN: 2053-1583
Publisher: IOP Publishing
Journal / Book Title: 2D Materials
Volume: 4
Issue: 1
Copyright Statement: Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Sponsor/Funder: Engineering and Physical Sciences Research Council
Publication Status: Published
Article Number: 011006
Appears in Collections:Physics
Photonics
Faculty of Natural Sciences



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