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. 2022 Jul 8;11:216. doi: 10.1038/s41377-022-00915-4

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© The Author(s) 2022

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Fig. 1 — The spatially overlapped two incident beams with opposite circular polarization states (σ⁻ and σ⁺) at the same frequency of ω lead to modulated THG at a frequency of 3ω as a function of the time delay (Δτ) in monolayer MoS₂ (acting as modulator). Inset is the top view of the crystal structure of monolayer MoS₂, and the triangles inside imply the D_3h symmetry.