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- W2000823682 abstract "We calculate the second-order nonlinear optical susceptibility for the sum-frequency generation (SFG) from two-dimensional (2D) hexagonal crystals with broken space inversion symmetry, such as graphene, grown epitaxially on a SiC substrate, and boronitrene (a single atomic layer of hexagonal boron nitride (h-BN)). We show that in the presence of two normally incident pump beams at frequencies and , a remarkably large output signal at frequency is generated in those materials in the two-photon resonant regime where the frequencies and are matched to provide a resonance for the radiated photon energy with the bandgap energy Eg of the materials. In addition, it is found that the absolute magnitude of the is resonantly enhanced when the photon energy of one of the input beams is tuned to the fundamental absorption edge. These resonant behaviors lead to very large values of , reaching the order of 10−4 esu for the graphene/SiC overlayer system and 10−6 esu for monolayer h-BN. Furthermore, even outside the resonances, the magnitude of is fairly large ( esu for the overlying graphene and 10−8 esu for boronitrene), which opens up new opportunities for practical exploitation of the SFG effect in the examined 2D crystals." @default.
- W2000823682 created "2016-06-24" @default.
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- W2000823682 date "2015-05-01" @default.
- W2000823682 modified "2023-09-27" @default.
- W2000823682 title "Spectral characteristics of the sum-frequency generation from atomically thin hexagonal crystals lacking center-of-inversion symmetry" @default.
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- W2000823682 doi "https://doi.org/10.1088/2040-8978/17/6/065502" @default.
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