Strong and Anisotropic Third Harmonic Generation in Monolayer and Multilayer ReS${}_2$

Abstract

We report observation of strong and anisotropic third harmonic generation (THG) in monolayer and multilayer ReS${}_2$. The third-order nonlinear optical susceptibility of monolayer ReS${}_2$, $\left|{\chi }^{(3)}\right|$ is on the order of $10^{-18}$ m${}^2$/V${}^2$, which is about one order of magnitude higher than reported results for hexagonal-lattice transition metal dichalcogenides such as MoS${}_2$. A similar magnitude for the third-order nonlinear optical susceptibility was also obtained for a multilayer sample. The intensity of the THG field was found to be dependent on the direction of the incident light polarization for both monolayer and multilayer samples. A point group symmetry analysis shows that such anisotropy is not expected from a perfect $1T$ lattice, and must arise from the distortions in the ReS${}_2$ lattice. Our results show that THG measurements can be used to characterize lattice distortions of two-dimensional materials, and that lattice distortions are important for the nonlinear optical properties of such materials.

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Cited by in corpus (7)

• Third-order nonlinear optical response of 2D materials in the telecom band
• Parametric Nonlinear Optics with Layered Materials and Related Heterostructures
• Cavity nonlinear optics with layered materials
• Nonlinear Tunable Vibrational Response in Hexagonal Boron Nitride
• Giant Transport Anisotropy in ReS${}_2$ Revealed via Nanoscale Conducting Path Control
• Non-linear optical spectroscopy and two-photon excited fluorescence spectroscopy reveal the excited states of fluorophores embedded in beetle's elytra
• Enhanced second-harmonic generation from WS${}_2$/ReSe${}_2$ heterostructure