Nonlinear Dispersion Relation and Out-of-Plane Second Harmonic Generation in MoSSe and WSSe Janus Monolayers
Abstract
Janus transition metal dichalcogenides are an emerging class of atomically thin materials with engineered broken mirror symmetry that gives rise to long-lived dipolar excitons, Rashba splitting, and topologically protected solitons. They hold great promise as a versatile nonlinear optical platform due to their broadband harmonic generation tunability, ease of integration on photonic structures, and nonlinearities beyond the basal crystal plane. Here, we study second and third harmonic generation in MoSSe and WSSe Janus monolayers. We use polarization-resolved spectroscopy to map the full second-order susceptibility tensor of MoSSe, including its out-of-plane components. In addition, we measure the effective third-order susceptibility, and the second-order nonlinear dispersion close to exciton resonances for both MoSSe and WSSe at room and cryogenic temperatures. Our work sets a bedrock for understanding the nonlinear optical properties of Janus transition metal dichalcogenides and probing their use in the next-generation on-chip multifaceted photonic devices.
Keywords
Cite
@article{arxiv.2303.03844,
title = {Nonlinear Dispersion Relation and Out-of-Plane Second Harmonic Generation in MoSSe and WSSe Janus Monolayers},
author = {Marko M. Petrić and Viviana Villafañe and Paul Herrmann and Amine Ben Mhenni and Ying Qin and Yasir Sayyad and Yuxia Shen and Sefaattin Tongay and Kai Müller and Giancarlo Soavi and Jonathan J. Finley and Matteo Barbone},
journal= {arXiv preprint arXiv:2303.03844},
year = {2023}
}
Comments
10 pages, 3 figures. SI: 8 pages, 5 figures