Optical harmonic generation in monolayer group-VI transition metal dichalcogenides
Loading...
Access rights
openAccess
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal
View/Open full text file from the Research portal
Other link related to publication
View publication in the Research portal
View/Open full text file from the Research portal
Other link related to publication
Date
2018-09-17
Major/Subject
Mcode
Degree programme
Language
en
Pages
Series
Physical Review B, Volume 98, issue 11
Abstract
Monolayer transition metal dichalcogenides (TMDs) exhibit high nonlinear optical (NLO) susceptibilities. Experiments on MoS2 have indeed revealed very large second-order (χ(2)) and third-order (χ(3)) optical susceptibilities. However, third-harmonic generation results of other layered TMDs have not been reported. Furthermore, the reported χ(2) and χ(3) of MoS2 vary by several orders of magnitude, and a reliable quantitative comparison of optical nonlinearities across different TMDs has remained elusive. Here, we investigate second- and third-harmonic generation, and three-photon photoluminescence in TMDs. Specifically, we present an experimental study of χ(2) and χ(3) of four common TMD materials (MoS2, MoSe2, WS2, and WSe2) by placing different TMD flakes in close proximity to each other on a common substrate, allowing their NLO properties to be accurately obtained from a single measurement. χ(2) and χ(3) of the four monolayer TMDs have been compared, indicating that they exhibit distinct NLO responses. We further present theoretical simulations of these susceptibilities in qualitative agreement with the measurements. Our comparative studies of the NLO responses of different two-dimensional layered materials allow us to select the best candidates for atomic-scale nonlinear photonic applications, such as frequency conversion and all-optical signal processing.Description
| openaire: EC/FP7/631610/EU//GrabFast | openaire: EC/H2020/696656/EU//GrapheneCore1
Keywords
Other note
Citation
Autere, A, Jussila, H, Marini, A, Saavedra, J R M, Dai, Y, Säynätjoki, A, Karvonen, L, Yang, H, Amirsolaimani, B, Norwood, R A, Peyghambarian, N, Lipsanen, H, Kieu, K, De Abajo, F J G & Sun, Z 2018, ' Optical harmonic generation in monolayer group-VI transition metal dichalcogenides ', Physical Review B, vol. 98, no. 11, 115426 . https://doi.org/10.1103/PhysRevB.98.115426