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. 2022 Dec 9;8(49):eabq8246. doi: 10.1126/sciadv.abq8246

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Fig. 2. — (A) The optical chirality–dependent selection rule in FWM due to threefold rotational symmetry in materials. (B) The normalized FWM output spectra in bulk SiO₂ and monolayer MoS₂ under the excitation of two input beams with different chirality combinations. (C) The truth table of the chirality XNOR logic gate. (D) The normalized cross-correlation spectrum of the FWM signal in MoS₂ with a Gauss fit. a.u., arbitrary units.